SYSTEMATIC 95 



Calliostomids, and to the species Calliostoma annulata from California but not to the genotype of 

 Calliostoma, are the very deep, narrow-based central tooth and the long ' goose-necked ' cusps on the 

 laterals. 



In Photinula coerulescetis the laterals are not so conspicuously ' goose-necked ' and the central is broad 

 and shallow-based, more nearly approaching the typical Calliostomid radula. The epipodial tentacles, 

 however, are six, and there is a distinct but small veil covering the top of each cephalic tentacle at its 

 base. 



Photinastoma taeniata (Wood) 



Trochus taeniatus Wood, 1828, pi. 5, fig. 12. 



Photinula taeniata H. & A. Adams, 1858, p. 427. 



Photinula taeniata Pilsbry, 1889, p. 278, pi. 44, figs. 18, 19. 



Photinula taeniata Rochebrune & Mabille, 1889, p. H87. 



Photinula taeniata v. Ihering, 1902, p. 101. 



Photinula taeniata Strebel, 1905, p. 135, pi. 5, figs. 28a, b, 29. 



Photinula taeniata var. elata Strebel, 1905, p. 138, pi. 5, fig. 28c. 



Photinula taeniata Melvill & Standen, 1907, p. 98. 



Photinula taeniata Strebel, 1908, p. 71. 



Photinula taeniata Melvill & Standen, 1914, p. 116. 



Dentition. Fig. H, 25, p. 190. 



Type locality. Unknown. Port Stanley, Falkland Is., here designated. 



St. 52. Port William, East Falkland Is., 7-4 cables N 17° E of Navy Point, 5 May 1926, 17 m. 



St. 53. Port Stanley, East Falkland Is. (hulk of 'Great Britain'), 12 May 1926, 0-2 m. 



St. 55. Entrance to Port Stanley, East Falkland Is., 2 cables S 24 E of Navy Point, 16 May 1926, 10-16 m. 



St. 56. Sparrow Cove, Port William, East Falkland Is., \\ cables N5o°E of Sparrow Point, i6May 1926, ioJ-i6m. 



St. WS 834. Off Coy Inlet, Santa Cruz, Patagonia, 52 57' 45" S, 68° 08' 15" W, 2 Feb. 1932, 27-38 m. 



St. WS 847. Off Santa Cruz, Patagonia, 50° 18' 45" S. 67° 44' 00" W, 9 Feb. 1932, 56-84 m. 

 Range. Strait of Magellan (Pilsbry, 1889), Patagonia ('Discovery') and Falkland Is. (Strebel, 1905 ; 

 Melvill & Standen, 1907; 'Discovery'), 0-84 m. 



A handsome species with red spiral lines on a smooth pearly white surface. 



Photinastoma taeniata nivea (Cooper & Preston) 



Photinula taeniata var. nivea Cooper & Preston, 1910, p. 112. 

 Type locality. Falkland Is. 



St. 51. Off Eddystone Rock, East Falkland Is., 4 May 1926, 115 m. 

 This seems to be something more than an albinistic form of taeniata. Paratypes, together with the 

 St. 51 material, show the following features not common to taeniata typical : no traces of colour pattern, 

 subobsolete spirally incised lines, and a taller spire with more globose whorls. Both species and sub- 

 species have three strong spiral cords on the first post-nuclear whorl. Unfortunately, only empty shells 



are available. 



Subfamily Stomatellinae 



Genus Margarella Thiele, 1893 

 n.nom. for Margaritella Thiele, 1891 non Meek & Hayden, i860 

 Type (o.d. ?) : Margarita violacea King 

 Margarella expansa (Sowerby) 



Margarita expansa Sowerby, 1838, p. 24. 

 Margarita expansa Sowerby, 1841, figs. 16, 17. 

 Photinula expansa H. & A. Adams, 1858, pp. 427-8. 

 Trochus {Photinula) expansus E. A. Smith, 1879, p. 167. 



