MARINE MOLLUSKS — MACGINITIE 139 



Family Diaphanidae 

 Genus Diaphana Brown, 1827 



Diaphana minuta Brown, 1846 

 Var. hietnalis Couthouy 



Diaphana minuta Brown, 1827, p. 11, pi. 38, fig. 7. — Lemche, 1948, pt. 1, figsi 



31-35; pt. 2, p. 72, figs. 1-21.— Abbott, 1954, p. 277, fig. 59b. 

 Diaphana Candida Brown, 1827, pi. 38, figs. 13, 14; 1844, p. 59. 

 Bulla hyalina Turton, 1834, p. 353. 

 Bulla hiemalis Couthouy, 1839, p. 180, pi. 4, fig. 5. 

 Bulla debilis Gould, 1840, p. 196; 1841, p. 164, fig. 95. 

 Bulla subangulata MoUer, 1842b, p. 79. 

 Utriculus candidus Brown, 1844, p. 59, pi. 19, figs. 13, 14. 

 Amphisphyra globosa Lov^n, 1846, p. 143. 

 Amphisphyra expansa Jeffreys, 1865a, p. 330. 

 Diaphana hyalina G. Sars, 1878, p. 289, pi. 18, figs. la-b. 

 Diaphana expansa G. Sars, 1878, p. 289, pi. 18, figs. 2a-b. 

 Diaphana globosa G. Sars, 1878, p. 290, pi. 18, figs. 3c, 4. 

 Diaphana hiemalis G. Sars, 1878, p. 291, pi. 18, figs. 3a-c. 

 Diaphana glacialis Odhner, 1907, vol. 41, pp. 53, 97, pi. 1, figs. 1-5. 

 Diaphana spirata Odhner, 1907, vol. 41, pp. 53, 97. 



Two living specimens were dredged, the larger (3.5 mm. high by 

 2.8 mm. in diameter) from 741 feet, the smaller (about 2.9 by 2.2 mm.) 

 from 295 feet. 



Other material examined: The figured type of B. hyalina and 

 several others from the Shetlands, the British Isles, Norway, and 

 Greenland. The figured type of '^Utriculus" expansus (Jeffreys) and 

 13 others from the Shetlands, Spitzbergen, Norway, and Greenland. 

 The figured type of A. globosa and 15 others from the Shetlands, 

 Norway, and Greenland. And others. 



Discussion: Lemche (1948), who has made a thorough morpho- 

 logical study of the northern species of Diaphana, finds no difference 

 in the soft parts and radulas of the species names listed in the synon- 

 ymy above. However, he recognizes 3 varieties of shells in the variable 

 species of D. minuta, but finds intergradations between all of these 

 varieties. In typical D. minuta var. minuta the spire is visible and 

 the aperture is shorter than the shell. In the var. hiemalis Couthouy 

 (plus globosa Loven) the spire is hidden, and the aperture extends the 

 full length of the shell. In the var. spirata Odhner (1907, p. 97) there 

 is a prominent "first whorl" or larval shell, which may protrude even 

 if the rest of the spire is more or less sunken. 



With the exception that the larger one is entirely mUky white and 

 the smaller one partially milky white, rather than h3^aline, the 

 shells from Point Barrow conform to the description of D. globosa 

 and therefore belong to the var. hiemalis Couthouy, (A chalky 

 appearance has been noted in several Arctic shells that are supposed 



473771—59 6 



