Cyclostrema, Adeorhis, Vitrinella^ and related genera, 131 



however, has been found to he a variety of Friele's Petterseni (1877) 

 (teste Friele and Sars). In P. Z. S., p, 91, 1883, Mr. Jeffreys men- 

 tioned " The umbilicus is sometimes encircled by one or more strong 

 spiral striae," which leads me to think that he had still other forms 

 erroneously referred to the species, more especially as Mr, Dall (op. 

 cit., p. 393) states that "A careful comparison of types leaves no doubt 

 as to the identity of these two forms" {affine V. and trochoides J.); 

 but the figures given by both Friele and Sars are very unlike affine 

 V. Petterseni is described as solid, 2:)erfectly smooth, white, with no 

 umbilicus proper, but a more or less distinct umbilical fissure, and the 

 figures show the form of the aperture and peritreme to be very simi- 

 lar to that figured by Jeffreys for the type of T/iarsis= Tharsiella, 

 as do also those given by Sars. 



As the specific name affine was used in 1883 by Jeffreys for 

 another species of Cyclostrema which now would be referred to Lis- 

 sos])ira, the name proxima^ given by Tryon in 1888, is adopted for 

 Professor Veri-ill's species. 



Lissospira diaphana (Verrill). 



CVcZosirema itap7ia?iM??i Verrill, these Trans., vi, p. 199, pi. xxxii, fig. 16, 1884; 

 Expl. Albatross, Report U. S. Com. Fish and Fisheries for 1883, p. 569, 1885. Tryon, 

 Manual of Conchology, x, p. 91, pi. 31, fig. 47, 1888. Dall, Bull. Mus. Comp. ZooL, 

 xviii, p. 393, 1889; Bull. U.S.Nat. Mus., No. 37, p. 166, 1885; Froc. U. S. Nat. 

 Mus., xii, p. 355, 1889. 



Plate XXII. fig. 2. 



Two specimens (No, 38409), station 2084, off Martha's Vineyard, 

 in 1290 fathoms, 1883, south to Brazil, in 281-1019 fathoms (Dall). 

 The locality, station 2004, as given by Professor Verrill was a typo- 

 graphical error. 



The operculum is similar to that of the preceding species and 

 hasistriatam as figured by Sars. The radula, however, shows inter- 

 esting, though slight, differences from that of the latter. The 

 median tooth being not broadly elliptical, but narrower above than 

 below, the sides at first straight but curving strongly outward below, 

 with a broad, blunt, delicately serrate, curved tip ; on either side 

 are four narrow, curved, lateral teeth, also with blunt delicately 

 serrate hooked tips ; beyond these are numerous, between 30 and 40, 

 very fine, hair-like, delicately hooked marginal teeth ; no serrations 

 were found on these. 



