72 Transactions. — Zoology. 



Enteric Canal. — Liver, spleen, gall-bladder. Eelative position 

 of chief organs. Pei'itoueum. Frozen sections. 



Gills. — Pseudobranch. 



Air-hladder.— 'RidigQ from fontanelle to tip of coruu. Convey- 

 ing sound-waves. 



Urino-genital Organs. — Histology of lymphatic glands. 



Circulatory Organs. — Third and fourth efferent branchial 

 arteries unite. 



Brain. 



Auditory Organ. — Position of otolith, &c. 



Parasites. — Tcenia sp.(?). Nematoda {Filar ia sp.?). Chondro- 

 canthus lotella. Lerne'a lotella. 



External Characters. — The lateral-line scales, besides differ- 

 ing from those covering the other parts of the body, also differ 

 among themselves. They are generally of an oval form. 

 Some, however, have an indentation at their posterior border. 

 Others have a prolongation from their posterior ends, and are 

 thus somewhat racket-shaped in appearance. 



In regard to the number of dermal-fin rays and branchio- 

 stegal rays there is considerable variation. I append the 

 statements given, without any qualification, by Professor 

 Hutton and by Dr. Giinther, and some of the I'esults ob- 

 tained by myself : — 



Hutton : D., 10/41; A., 41 ; V., 6; B., 7. 

 Giinther: D., 10/42; A., 40; V., 6; B., 7. 

 Beattie: D., 10-12/39-45 ; A., 43-50; V., 5; B., 7. 



From this table it will be noticed that, while both Hutton 

 and Giinther make out 6 rays in the pelvic (ventral) fin, I 

 have been able to make out only 5 in the twenty-five to thirty 

 specimens which I examined. Again, in not a single speci- 

 men have I got less than 43 rays in the ventral (anal) fin, 

 while the numbers of Hutton and Giinther are 41 and 40 

 respectively. In fact, in only four specimens did I make out 

 43. In all the others the numbers ranged from 44 up as high 

 as 50, 45 and 46 being the predominating numbers. The 

 numbers in the dorsal fin also show considerable differences. 

 In the anterior part 10 seems to be the usuoi number, but in 

 two specimens I counted 11 and in seven specimens I made 

 out 12. In the posterior part I make 43 and 44 the most 

 usual numbers. In only one specimen, and that a very young 

 and small one, did I find 41, the number given by Professor 

 Hutton ; two had 42, one 39, and two 45. 



Skeleton. — This agrees in the main points with the typical 

 Teleostean skeleton. There are, however, certain modifica- 

 cations. The most noticeable and perhaps the most inter- 

 esting of these is the mode of articulation of the dermal-fin 

 rays with the interspinous bones (fig. 10). Each interspinous 



