EXPEDITION TO POINT KAKIIOW. ALASKA. 181 



Heliotropia harp a (Mi">r<-li) Hull. 



/ H.MIS ,lij',,i-mi- Midil. M;il. K'nss, ii, ji. 1 111, 1^ I'.', nut of KVi-vr. 



OIK; young, living specimen in L'!A fathoms, HlJiiilcs west of Point J-'ranklin. Museum iiuiubcr 

 !ti!>77. This species is distinguished from /'. ilrformcbyits coarser spiral stride and brighter colors. 

 It extends south to the Aleutians, where it readies a very large si/e. The undelincd name J'yru- 

 lofttsus was applied to the Atlantic species by Morch. 



Strombella Beriugii (Midd.) Ball. 



Ti-Honiuiii Jlcrini/il Midd. Mai. lioss. ii, ]>. 147, pi. :'., lif;-s. .">-ii. Isl'.i. 



A dead specimen on the beach near the st at ion. .Museum number, 40!i7s. 



The genus StromleUtt dray is slightly anterior to Volutopsls of Morch, and has the advantage, 

 of a diagnosis. The Mromlcllw of Schleutcr, which has been unnecessarily assumed to exclude 

 Gray's name, has no standing whatever, being a mere word in a catalogue without diagnosis or 

 identified type or description of any kind. 



This species has fewer transverse ribs than ('liri/xinloiinix h'rniiicott!! Dall, with whieli it has 

 been confounded, and wants the fine characteristic sculpture of the latu r. From the following 

 species it differs in its light color; rude, short spire, absence of earimc, imuv rapidly increasing 

 whorls, rounded concavities between more numerous ribs, and few coarse spine or threads. 



Strombella malleata Dall. 



StrombeUti mallftiln Dall, 1. <.-., p. ~>'iT>. 



One specimen from the beach near the station. .Museum number, lO'.iT'.i. The writer has col- 

 lected this species at Icy Cape, Cape Lisburne, Point Lay. Kot/chue Sound. Point Spencer, at 

 Port Clarence, and other localities within the Arctic basin. 



It is long' and slender, the young shell forming several whorls in an -almost cylindrical coil 

 before they begin, to enlarge; the adult may reach six inches in length. The surface is covered 

 with, fine spiral stria- and a thin brown epidermis. It differs from the preceding in its dark purple 

 color, its few (generally five) transverse ribs, bet ween which the space is nearly Hat rather than 

 concave, and a sharp earina on the anterior periphery of the last whorl on which the suture is laid. 

 The nucleus is large and blunt, the canal short, the form of the mouth variable in din'ercnt stages 

 and specimens; the outer lip thin, the aperture dark purple within the last whorl, less than half 

 the length of the shell in nearly all cases. It is usually rude and more or less worn, even when 

 living; the cylindrical tip is usually broken off, but the polygonal section of the whorl is very char- 

 acteristic. 



Trqphon clathratus I.. 



A dead specimen at Cape Smythe, and another, rather stouter, at 10 miles west from Point 

 Franklin, in l.'U fathoms, mud and sand. Museum number, 40980. This .-.pecies is very variable 

 in relative proportions and closeness of varices. 



Turritella iTachyrhynchus) polaris Ui-ck. 

 '/'. c JWK t'imtlioiiy. 



One specimen, ten miles west of Point Franklin, in I3i fathoms mud. Museum number, 40981. 



Trichotropis borealis ]>r<><!iTi|> A Smvrrliy. 



One specimen in ."> fathoms: Norton Sound; dead. Museum number. -10982. 



Trichotropis (Iphiiioe) arctica (Midil.) Dall. 



Caiii-cHariii (tnt'u-n Miilil. Mill. HOBS, ii. ]>. II-.'. pi. ix, li^s. 11, !-.>. I."., ]A|!i. 



JJeach near station, also Norton Sound, in ~> fathoms. Museum number. 40<K'!. It was origi- 

 nally brought by AVossnessenski from P.ering Strait. 



Crepidula grandis Midilomlovli. 



One young specimen from l.'U fathoms. 1(> miles west from Point Franklin. Museum num- 

 ber, 40!)SJ. 



