1868.] COMMANDER KNOCKER ON PELAGIC SHELLS. 621 



rounded on both surfaces ; the terminal point strongly but gradually 

 curved. Being damaged on the anterior part, I cannot describe it 

 further. I do not find anything similar in Raug's work. It is the 

 only specimen I obtained. 



Hyalea. 



19th April 1868. This is probably a variety of H. longirostra ; 

 the rostrum much more compressed, more elevated, and curves up 

 sooner than in the true H. longirostra. 



Hyalea (name not made out). 



19th and 30th April. The only two days I got this shell, and I 

 find no Hyalea corresponding to it in the work of M. Rang. The 

 terminal and lateral points truncated and very little developed ; the 

 dorsal plate prolonged considerably in a gentle curve and forming 

 an obtuse point ; dorsal markings three ; ventral plate much rounded 

 (globular), striated, nearly square anteriorly. It resembles more 

 H. quadridentata in shape, except the points and projecting plate ; 

 it is also wider in proportion. 



Ianthina? 



3rd and 8th April 1868. Aperture very large; spire depressed, 

 umbilicated ; lip reflected over umbilicus ; no notch ; colour deep 

 blue and strongly striated. 



Litiopa. 



29th November and 4th December 1867. Resembles much the 

 Litiopa bombyx of the Saragossa weed ; and if of this species, it is 

 worthy of notice that it should occur on both sides of the American 

 continent, although not in quite similar latitudes. 



Litiopa. 



4th December. Another species, light yellow horn-colour; body- 

 whorl very large ; sutures deep and very marked ; spire short, mam- 

 millated (not acute as in the other) ; whorls five ; aperture nearly 

 complete. 



Cheletropis, No. 1. 



Whitish cream-colour, aperture and sutures brownish ; spire short, 

 obtuse ; whorls five, the last large, strongly marked spirally, less so 

 but very finely transversely, giving a granulated appearance ; claws 

 in three points. 



Cheletropis, No. 2. 



Deep brown or liorn-colour. These I found most plentifully near 

 the Line on the Atlantic side. 



