62 MOLLUSCA OF THE 'lightning' ETC. EXPEDITIONS. [JaQ. 20, 



Having myself seen this remarkable species dredged off Martha's 

 Vineyard on the New-England coast, and carefully compared it with 

 the Mediterranean and fossil species, I cannot find the slightest 

 difference between any of the specimens. It is the Cerithiutn 

 terebrale of C. B. Adams, Bost. Journ. N. H. iii. pi. 3. f. 7 (1841). 

 The occurrence of this European species not merely on the coasts of 

 North America but also in tlie Miocene formation of both countries 

 is remarkable. 



The last whorl has a basal ridge or keel, besides a thread-like line 

 below it and encircHng the pillar. The apex consists of two or three 

 smooth and glossy whorls ending in a globular point. There is the 

 same very short caual as in Cerithiopsis ; but the pillar is longer, 

 more flexuous, and recurved at its base as in the typical species of 

 Cerithium. 



I have a fragment of a Cerithiopsis or Cerithium from Station 1 6 

 of the 'Porcupine' Expedition of 1870, which is worthy of notice. 

 Each whorl has curved longitudinal ribs, which are crossed by two 

 thread-like spiral striae. It is figured in Plate VI. fig. 10 for future 

 identification, and may be called bizonalis or bizomle. 



Summary of the foregoing Mollusca. 

 Families. Genera. No. of species. 



XIX. lANTHINID^ Ianthina 2 



XX. NATICIDiE Natica.... 21 



XXI. NERITID.E Neritina 1 



XXII. SOLARIID^E Solarium 4 



Adeorbis 4 



fossarus 1 



Seguenzia 6 



XXIII. XENOPHORID^ .... Xenophora 1 



XXIV. VELUTINIDiE Lamellaria .... 2 



XXV. CAPULIDiE Capulus 1 



XXVI. CAN CELL ARIIDiE. . . . Torellia 2 



Trichotropis .... 3 



Cancellaria .... 4 



XXVII. APOERHAID^ Aporrhais 2 



XXVIII. CERIT HIID^ Stilus I 



LiEOCOCHLIS 1 



Cerithium 10 



XXIX. CERITHIOPSIDiE .... Triforis 2 



Cerithiopsis .... 7 



Total 75 



Pig. 1, la. Nafica notahilis, p. 31 



2, 2«. siibplicata, p, 32. 



3, a7iffidata, p. 32. 



4, 4a. globosa, p. 3.3. 



5, 5a. co'inpacta, p. 33. 



EXPLANATION OF THE PLATES. 



Plate IV. 



Fig. (3, (i«. Natica ohtusa, p. 33. 



7, la. operculata, p 34. 



8, 8rt. Adeorbis deprcssus, p. 41. 

 '9. Fossarus reticulatus, p. 41. 



