286 BULLETIN OF THE 



It i9 evident from the above table that the two previously unnamed sections 

 6hould bear the names applied by Schumacher, instead of those given to the 

 same things at a later time. Thus the section of Crepidula, called Crypta 

 (Gray) by Dr. Fischer in his Manual, should take the name of Sandalium 

 if the section is to be retained; and the Trochatella of Lesson (1830, not of 

 Swainson, 1840) must give way to Trochita of Schumacher. In this way only 

 can the rules of nomenclature be satisfied, even if it were not due to the very 

 remarkable ability shown in his system by Schumacher. He was by far the 

 most clear-headed of the early conchological systematists except Lamarck. The 

 reference of this group to the Infundibulum of Montfort by several naturalists 

 is an error. Montfort would doubtless have referred a Trochita to his genus 

 Infundibulum ; but his type, distinctly figured and unmistakable, is no Trochita, 

 as he recognizes in his remarks, but the shell called Carinidea by Swainson, 

 as Dr. Fischer has correctly stated (Manual, p. 817). 



Crepidula (Sandalium) aculeata Gmelin. 

 C. aculeata Gmelin, Tryon, Man., VIII. p. 129, pi. xxxix. figs. 61-65, 1886. 



Habitat. Gulf of Mexico, near the Tortugas, at Station 44, in 539 fms., 

 bottom temperature 39°.5 F. 



One living but dwarfed and white specimen was found at the above depth. 

 The species extends to Cape Hatteras in a northerly direction, and is abundant 

 below tides on the Florida Keys. It is common in the Southern Pliocene. 



Beside the above, Crepidula convexa Say and C. fornicata Linne enter this 

 region from the north; though I have seen no typical fornicata except from 

 the mainland, the variety C. navicula Dunker replacing it among the islands. 

 C. glauca Say i» only a particular form of juvenile C. fornicata. There are 

 innumerable synonyms. 



Family CAPULID^. 

 Genus CAPULUS Montfort. 



An investigation of the literature in regard to this genus shows how little is 

 known in regard to some of the commonest mollusks, and how necessary to 

 a proper understanding of their relations is a reliable account of their most 

 prominent anatomical features. 



In nearly all manuals or works relating to this genus we find the type spe- 

 cies C. hungaricus Linn4 represented as having the " rostrum lengthened " 

 (Tryon), "mufle allonge" (Fischer), "head broad and thick with produced 

 lips so as to make the extremity of the muzzle appear cloven " (Jeffreys), and 

 "head snout-like" or with "extensile snout" (Jeffreys). In 1858 Bretherton 

 stated in the Zoologist, that " the proboscis or rostrum (like that of Cyproza it 

 appears to be of an intermediate character) is capable of extension, and can be 



