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Description

Calliostoma modestulum, Strebel.

 

 

Calliostoma modestulum, H. Strebel, Schwed. Sudpolar Exped. p. 70, Taf. i. fig. 13 a, b (1908)

 

 

Hab.—Station 346, Burdwood Bank, 56 fathoms, from Sponge.

 

Two very young specimens, trochoïd in form, with the upper whorls elegantly, spirally lirate, we assign to the above name with a little doubt. The original type came from the West Falklands, lat. 52º 29’ S., long. 60º 36’ W., dredged at 197 metres (STREBEL).

 

With this occurred Photinula expansa, Sowb., and one broken example of a beautifully nacreous shell, which, judging from the figure,* may be Calliostoma möbiusi, Strebel. Our specimen is more trochoïd than photinuloid, though it possesses some characters of the latter, and is lightly spirally grooved, these being most conspicuous at the periphery of the body whorl. Dimensions: alt. 10, diam. 12 mm. It likewise may be compared with Photinula Crawshayi,† Sm., from Christmas Island, but the whorls are not ventricose. It is unfortunately somewhat broken; the operculum is present, being horny and multispiral.

 

 

*STREBEL, Moll. der Magalhaen. Prov., ii. p. 133, Taf. v. fig. 22.

 

†SMITH, Proc. Malac. Soc. Lond., vi. p. 335, fig. 2.”

 

 

(Melvill & Standen, 1912: 347)

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© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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