34 F. Stoliczka — Land-sliells of Pen anj Island. [No. 1, 



A second species is very closely allied to Vaginulus Tourannensis, Ey- 

 doux and Souleyet, (Voyage de la Bonite, pi. 28, figs. 4 to 7), found by Mr. 

 Gaudichaud at Touranne in Cochin China. 



A close examination of various eastern species of what authors usually 

 call Vaginulus or Veronicalla appears to me to indicate, that a great confu- 

 sion has been brought about into the definition of these terms. First of all, 

 we have to return to the typical species of those two generic terms, leaving 

 all subsequent researches regarding other species out of the question. 



BlainvillG's description of his Veronicella Icevis in 18 L7 was incorrect as 

 regards the existence of a rudiment of a shell. The mistake was, at least 

 partially, corrected by Blainville in Diet. d. Sc. Nat. vol. 57, p. 348,* and 

 Keferstein, after discussing the opinions about this genus, in Zeitsch. Wiss. 

 Zool., XV, 1864, definedf Veronicella as it ought, I think, to be accepted. 



The animals have the sexes distinct in one individuum, the male organ 

 under the right peduncle, the female about the middle of the lower right side 

 of the mantle ; tentacles bilobed ; the anal and respiratory orifices are at the 

 posterior end ; the jaw and teeth of the radula resemble those of the Heli- 

 ciD^. Thus the general anatomical structure of Veronicella agrees in some 

 respects with Oncliidiam (comp. Stoliczka in J. A. S. B., xxxviii, pt. ii, 

 1S69, p. 88, pi. xiv), but in this genus the female genital opening lies with 

 the two others at, or close to, the posterior end ; the teeth are peculiarly 

 hook-shaped, and there is no jaw present. As one of the characteristic fi- 

 gures of a Veronicella I may mention Vag. Solea, d'Orb., (Voyage dans 1' Am. 

 merid., Moll. pi. 21) from Buenos Ayres, or Vag. Luzonicus, Eydoux and 

 Souleyet, in Voyage de la Bonite, Zoologie, vol. II, p. 495, pi. 28, figs. 1—3. 

 Thus our species will have provisionally to stand as 



Veeots^icella Birmanica, (Theob.). 

 It is found all over the island, up to the top of Penang hill, but is not 

 common, and the specimens are mostly small, about 1 or 1*5 inches. The 

 median dorsal pale stripe generally becomes distinct only in older specimens, 

 and the lower side of the mantle is uniibrm livid ; in very young specimens 

 the pale stripe is absent, and the mantle marked below with dark dots. 



The name Vaginulus was introduced by Ferussac in 1821. Judging 

 from the description of the genus, in part at least, from the arrangement of 

 the species and from the anatomical account given by Blainville, it is, I 



* In this article, Blainville strangely makes a great mistake in considering 

 Vaginulus, Veronicella and Onchidium as identical. 



t Comp. also Humbert in Mem. Soc. Ph. & So. Nat. Geneve, vol. xvii, and E. v. 

 Martens Preuss. Exped. p. 175, Vaginulics, 



