1856.] 47 



Four speciraeas were found in a large cream-colored liver, which had beeu 

 left upon a stall in our fish market. I could not ascertain the species of fish 

 from which it had been obtained, but I suspect it to be the halibut, Ilippoglossas 

 vulgaris. Each worm was closely coiled up at the bottom of a long clavate sac, 

 which was composed of three distinct membranes. The first membrane adhered 

 to the structure of the liver in which it was imbedded, beneath the peritoneum. 

 The second membrane was transparent, crisp, and shining. The third one was 

 milk-white, soft, and contractile ; and it presented a delicate, tortuous, white 

 opaque line extending the length on each side. After opening the third mem- 

 brane, beneath water, the worm gradually crept out of its own accord. 



63. Phntastomum subcylindricum Diesing. 

 Pentastomum. Didelpkidis virginianw Leidy, Pr. A. N. S., v, 9G. 

 In cysts of the liver of the opossum, Didelphis virginiana. 



64. Pentastomum euryzonum Diesing. 

 In the liver of Cynocephalus porcarius. 



65. Pextastomum proboscideum Rud. 

 In the lungs of the Boa constrictor. 



66. Pextastomum gracile Diesing. Body sub-clavate, incurved, most nar- 

 rowed anteriorly, annular, not plicated, with the margins of the annuli mici-os- 

 copically denticulated. Head obtuse, bothria subterminal, elevated, each with 

 two hooks, of which the upper one is the smaller. Mouth elevated, conical, in 

 the focus of the semicircle formed by the bothria. Length from 3 to 4 lines, 

 breadth J of a line. 



Eleven specimens were obtained by Jos. Jones from the stomach of the .4/- 

 ligator mississipiensi-s. 



RHYNGODEA. 



67. Greoarina Juli marginati. 



G-regarina larvala Leidy, Pr. A. N. S., iv, 232. 



Gregarina Juli marginati. Leidy, Trans. Am. Phil. Soc, 2a , x, 237. 



63. Gregarina Juli pusili. 



Leidy, Trans. Am. Phil. Soc, 2a ser., .v, 23R. 



69. Gregarina Polydesmi virginiensis. 

 Ibidem. 



70. Gregarina Passali corn tin. 

 Ibidem. 



71. Gregarina Achbt^ abbreviat.*;. 

 Ibidem. 



72. Gregarina Locust.e carolin.e. 

 Ibidem, 239. 



73. Gregarina blattarum Siebold. 



Gregarina Blattce orientalis. Leidy, Trans. Am. Phil. Soc, 2d ser., x, 239. 



74. Gregarina Scarabei reucti. 

 Gregarina. Leidy, Pr. A. N. S., v, 208. 



Gregarina Scarabei relicti. Leidy, Pr. A. N. S., v, 287. 



75. Gregarina Melalonth.e brunne^. Body oblong oval ; head oblate 

 spheroidal, slightly elevated at the summit. Single and in pairs. Length of 

 body .405 mm, breadth .252 mm; length of head .108 mm, breadth .144 mm. 



Found in the intestine of Melalontha brunnca. 



76. Gregarina Nereidis dbnticulat.^. 

 Leidy, Journ. A. N. S., 2d ser., iii, 144. 



