^^®6 Zoological Collectimis. Invertebrstta. 



extremity of the body. On the sides of the head there is a small groove, 

 along which are found from seventeen to twenty ocular points. 



This animal has a great analogy with the genus Meckelia, recently esta- 

 blished by M. Leuckart. The author calls this species Notospermus 

 drepanensis. {Notospermus from V(f}roc, dorsum, and <S'7fi2,lJ^OL, semen, because 

 there is in the interior of- the back an organ which M. liuschke considers 

 as the spernnatie duct. (Isis, 1830.)— J5«?/. des Sci. Nat. Nov. 1830. 



New species of Anatifa. 

 Anatifa Mauritia Desjardins. Anatifa striata Auet. 



A. testa compressa, valvis substriatis ,- majores utrinque punctatis. 



A. with shell compressed, valves substriated ; the largest punctuated on 

 each side. 



This shell has five valves, and is much more elongated than the known 

 species. The two largest valves are trapezoid ; and, as in all the other 

 valves, there are fire lines of growth which give the striated appearance. 

 There are also seen, on these valves, other oblique stria? extending from 

 the anterior angle of the base of the large valves, and iniiting with similar 

 striae, which are on the two middle valves ; a line formed of sunk points is 

 remarked on each large valve ; it follows the same direction as the striae just 

 spoken of, and is more or less apparent in certain individuals. The dorsal valve 

 passes beyond the base about a line in the large individuals, and forms at 

 this place, that is to say, at its extremity, a small hook. The middle 

 valves are subtri angular, and truncated at the end. This shell, which is 

 about thirteen lines in length, and seven lines in breadtli, is not quite 

 three lines in thickness. The valves are white when the animal is dead, 

 and have a light violet tint when it is alive. The peduncle, of a beautiful 

 crimson red colour, is one inch and more in length. By this part, the 

 animal is strongly attached to pieces of wood. 



On the 21st October, 1829, when walking along the shore of the Quartier 

 de Flacq, (Island of Mauritius,) between the post and the Quatre- Cocas, I 

 found on the sandy beach a piece of wood covered by these anatifae : they 

 were all dead and dried. There were parts of the wood Avhere they were 

 heaped together in hundreds ; their ciliated tentacular arms were in some 

 protmded and dried. — Julien Desjardins Ann. des Sci. Nat. Dec. 1830. 



Physalict. — In an excursion made on the sea coast, more than a month 

 ago, I found, in that part of our island (Mauritius) called Quartier du Grand- 

 Port, the coast covered for several miles with Physalice, Velclla, Janthina, 

 SpirulcB, Glaucus, &c. but few of the latter. Having taken one of the Phy- 

 salice into my hand, I M'as soon obliged, by the pain which it occasioned, to let 

 it go. This was in the morning : I sufl^ered until night, and the next day I 

 still felt it, but especially during two hours after touching this animal, I felt 

 an acute pain throughout the whole arm, and particularly in the axillary 

 glands Julien Desjardins Ibid. 



Janthinas Among the Janthina, I found the two species described by 



Lamarck, and one which I think is a distinct species. I know that M. de 

 Blainville has described several of them, which you admit in your Dictionnaire 

 Classique only as varieties. I send you a description of one which I found 

 in very small quantity : it is true that I did not distinguish this third species 

 until my return from my excursion, although, on collecting them on the 

 coast, their fades struck me. I here transcribe the description written in 

 my manuscript Fauna of the Mauritius. 



Janthina Mauritiana, Nob 1 take it upon me to give a name to this 



species, which is particularly distinguished by the following characters from 

 the two already cited. The columella, instead of exceeding the right 

 margin of the opening, is, on the contrary, shorter, and the base of the 



