180 



stoma (Linguatula, Rudolphi) armillata, Wyman, whicli infests the 

 lungs of the Python Seice, of Africa. This species of Entozoon was 

 first desci'ibed in the Journal of the Boston Society of Natural Histo- 

 ry, Vol. v., p. 294, To the description there given, the following 

 particulars are added : — 



The number of individuals found in the lungs of the specimen of 

 Python here noticed was six, all but one of which were females, and 

 the longest measuring six inches in length. The form of the females 

 is cylindrical, somewhat flattened on the under side, and gradually 

 diminishing from the middle backwards. The tegumentary rings are 

 large, prominent, and fleshy, widely separated, and placed a little ob- 

 liquely on the body ; eighteen of them are well defined ; four more 

 are contained in the head, and scarcely to be distinguished from each 

 other. The hooks, four in number, are arranged in a curved line 

 which is concave upwards, the mouth being in the middle of the line ; 

 and above it, on the foremost part of the head, are two prominent pa- 

 pillae, slightly separated from each other. The muscular system con- 

 sists of bands of longitudinal fibres, separated by narrow intervals, 

 except on the middle line beneath, where there is a wide space with- 

 out such fibres, and through which the viscera are easily seen. The 

 genital orifice is in fi'ont of the anal. 



The male was much smaller, only 1.84 inch in length, of an elon- 

 gated conical shape, regularly tapering to a point from the head 

 backwards. There are only fourteen distinct fleshy rings, and four 

 more in the head but imperfectly defined. Besides the two papillfe 

 on the top of the head, as seen in the female, there are two others on 

 each side, one over each of the hooks. 



Van Beneden, in his description* of P. proboscidea, describes the 

 testis as being beneath the intestine ; — in P. armillata both ovary and 

 testis are above^ or on the dorsal side of, the intestine. In the female 

 the spermatheca is of a spherical shape, instead of being cylindrical, 

 and ending in an oval pouch as in P. proboscidea. Van Beneden 

 has given the embryology of this genus, and shown its afiinities with 

 the Lerneans. 



Mr. A. Agassiz exhibited drawings of a new genus of Physophorce. 

 It is closely allied to Halistemma Huxl. and Agalmopsis Sars. The 

 swimming bells are arranged in two rows; in the largest perfect 

 specimens found there were not more than four on each side ; they 

 resemble those of Agalmopsis. The tentacles are of three kinds — 

 clusters of long, slender threads, which they throw about in every 

 possible direction, having club-shaped appendages without filiform 

 terminations ; the second kind are clusters of short, corkscrew-shaped 



* Mem. Acad. Koy. des Sc. Beiges, T. xv. p. 188. 



