138 



PROCEEDINGS OF THE ACADEMY OP 



[1888. 



April 3. 

 The President, Dr. Joseph Leidy, in the chair. 



Twenty-two persons present. 



A paper entitled " Researches on the General Anatomy and 

 Physiology of Nerves and Muscles, No. II. " By Henry C. Chap- 

 man M. D. and Albert P. Brubacker, M. D. was presented for pub- 

 lication. 



A Crustacean Parasite of the Red Snapper. — Prof. Leidy remarked 

 that in the examination of the fish called the Red Snapper, Lutjanus 

 Blackjordi, brought to our market from Florida, he had observed a 

 curious crustacean parasite adhering to the throat about the pharyn- 

 geal bones. It appears to be an undescribed species of Anchorella, 

 which, from its having a bundle consisting of half a dozen posterior 

 appendages, including a pair of large egg pouches, may be named 

 A. FAscicuLATA. The animal is milk white, though in the fresh con- 

 dition the egg pouches are slightly reddish, 

 and it is about half an inch long, including 

 the latter. The body is pyriform with its 

 long axis in the same line with the single 

 (suspensory arm, and with the head and neck 

 curved outward and a little downward to 

 one side. The head is bird-head-like in 

 shape, with beak directed upward and fur- 

 nished Avith two pairs of minute maxillipeds. 

 The suspensory arm, or brachium, about as 

 long as the head and neck together, is straight 

 and is surmounted by a button, which is ses- 

 sile and internally striated. At the base of 

 the brachium on each side there is a minute 

 papilla. The posterior appendages consist 

 bf two long cylindrical egg pouches and on 

 each side two much shorter sausage-like 

 pouches. The adjoining figure is an outline 

 of the parasite magnified six diameters. 

 Twenty-five were obtained from one fish. 

 Measurements of a specimen are as follow : 

 Length of body with brachium 2-5 mm ; 

 length of brachium 1-25 ; of head and neck 

 1-75 ; head 1' by 0-625 ; breadth of body 

 . , ,, ^ . , , 1-375 ; leng-th of egg pouches 4-, thickness 



Anchorella faiciculata ^ t^i", i>- t, t^^ I n /inc i 



(6 diam.) 0-625 ; length of short pouches 1-625 and 



1-25. Clinging to the head of one of the females of the Anchorella 

 was a minute male measuring 1-125 mm. in length. With the Ancho- 

 rellae was found a single specimen of Caligus which closely resembles 



