382 HAPLOCHITONID-aJ. 



total length (without caudal), the length of the head is contained in 

 it four times and one-third. Snout longer than the eye, its extent 

 being equal to the width of the interorbital space. Jaws equal in 

 length anteriorly ; the cleft of the mouth extends somewhat behind 

 the anterior margin of the orbit. Erownish yellow, with numerous 

 brown dots and vertical stripes. 



Tierra del Fuego and Falkland Islands. 



a. Adult. Port Louis (Cape Horn). Presented by Sir John Rich- 



ardson. 



b, c-d. Adult and half-grown. From the Haslar Collection. 

 e—f. Adult. Presented by the Royal College of Surgeons. 



2. Haplochitou tseniatus. 

 Aplochiton taeniatus, Jenyns, Voy. Beagle, Fish. p. 132. pi. 24. fig. 2. 

 B. 3. D. 12. A. 15. Y. 7. 



The height of the body is one-fifth or one-sixth of the total length 

 (without caudal), the length of the head rather more than one-fifth. 

 Snout longer than the eye. Cleft of the mouth extending behind 

 the anterior margin of the orbit. Lower jaw rather longer than the 

 upper. Uniform greenish, with a pale silvery band along the middle 

 of the side of the body. 



Tierra del Fuego. 



a. One of the typical specimens. Goree Sound. 



2. PROTOTROCTES. 



This genus has the general habit of a Corec/onus ; however, the 

 scales on the front part of the body are rather irregularly arranged 

 in series descending obliquely forward. The dorsal fin occupies a 

 position somewhat posterior to that of the ventrals, which are in the 

 middle of the length of the body, and composed of seven rays. Adi- 

 pose fin small ; caudal emarginate ; anal of moderate length. Eye 

 of moderate size. Teeth minute, in a single series in the jaws, on 

 the vomer, and on the palatine bones. Gill-openings rather wide, 

 the gill- membranes not attached to the isthmus. Branchiostegals 

 six. 



Southern Australia. 



1. Prototroctes maraena. 



B. 6. D. 10. A. 19. P. 13. V. 7. L. lat. 78. L. transv. 19. 



The body of this singular fish is compressed, its height being about 

 one-fourth of the total length (without caudal) ; the belly appears to 

 have been strongly compressed, as the scales of one side do not extend 

 on to the other, leaving a naked groove along the entire median line 

 from the ventrals to the anal. The head is remarkably small, its 

 length being one-sixth of the total without caudal ; it terminates in a 



