140 BUCCINID^. 



periostracuin. The distinction of "spinous" for Busycon or 

 rulgur,and "tuberculated " for Sycotypus is of little importance 

 generically, as the Fulgurs are frequently only tuberculate when 

 young and become spinous with advancing age ; moreover, the 

 miocene series serve to connect the two groups in this respect. 

 Under these circumstances I judge it better to make Sycotypus 

 a subgenus only, under Fulgur. 



Mr. T. A. Conrad (Am. Jour. Conch., iii, 182) attempts to dis- 

 tinguish the embryos of Sycotypus from those of Fulgur by the 

 latter having a long fissure parallel with the columella, whilst 

 the columellar region of the former is entire. Mr. Conrad's 

 specimens, which are before me, and which I saw him extract 

 from the pouches, certainly show this difference, but I have 

 since had occasion to examine the embryos of Fulgur several 

 times, and from different strings of pouches, none of which show 

 the slit columella ; the character was probably pathological. 



TAPHON, H. and A. Adams. Shell dextral, transversely striated, 

 whorls rounded ; aperture ovate, fore-part produced into a long, 

 slightly recurved canal. F. striatus, (xray (xlix, 19). 



SYCOPSis, Conrad. Shell tuberculate, not canaliculate. Eocene 

 and Miocene. Differs from the genus in having tubercles instead 

 of spines on the shoulder. 



Streptosiphon, Gill. 



Distr. — S. porphijrostoma, Ads. and Reeve (xlix, 50). Eastern 

 Seas, Senegal. 



Shell subfusiform ; spire rather short, apex papillarj^ ; whorls 

 ahgulated at the upper part and tuberculate on the angle ; colu- 

 mella concave, with a double very oblique fold on the lower part; 

 canal moderately long, twisted ; aperture lirate within. Oper- 

 culum and animal unknown. Seems to connect Busycon with 

 Tudicla. 



TuDiCLA, Bolten. 



Syn. — Spirilla, Humph. Pyrella, Swn. 



Distr. — 5 sp. Indian Ocean, China, Australia. T. inermis, 

 Sowb. (xlix, 21). 



Shell fusiform ; spire short, apex papillary ; aperture oval ; 

 canal very long, narrow, straight ; columella smooth, flattened, 

 with a single large, or three smaller transverse folds at the fore- 

 part. Operculum fusoid. Dentition unknown. 



PAPiLLTNA, Conrad. Pjn-iform ; shoulder angular and spinous ; 

 beak long, with an obtuse fold on the columella ; three volutions 

 from the apex forming a papillated summit. F. papillatus, 

 Conrad (li, 58). Eocene ; Claiborne, Ala. 



PERissoLAx, Gabb. Spire depressed; body-whorl patulous; 

 canal long ; columella without folds or plaits. Distinguished 

 from Papillina by the want of a columellar fold, and evidently 



