1884.] GENERA SICYDIUM AND LENTIPES. 157 



the upper lip. Only the extremities of the horizontal teeth visible. 

 Maxillae contain an obtuse angle. The total length of the body 

 (without the caudal) is four times the length of the head ; the 

 width of the head is considerably greater than the height and nearly 

 equal to the length ; the height of the body is two ninths of the 

 length. Scales small ; those on the body and tail are subequal and 

 larger than those on the neck and belly. The diameter of the eye 

 is one seventh of the length of the head and one third of the inter- 

 orbital space. The length of the pectoral is greater than that of 

 the head. The third, fourth, and fifth dorsal spines are produced 

 into long ribands ; the fourth, which is the longest, is about twice 

 the height of the body. Colour either uniform olive-brown, dorsals 

 with irregular dark marking and anal with a dark marginal band, 

 or yellowish marbled with brown. 



The largest specimen measures nearly 7 inches. 



Hub. West Indies. 



Nine specimens, adult, half-grown and young. 



2. Sicydium antillarum, sp. u. (Plate XII. fig. 3.) 

 D. 6ji. A. ~. L. lat. G8. 



Teeth in the upper jaw long, slender, and bent inwards over the 

 gum at about right angles. A row of small lamelliform transverse 

 papillae on the gum beneath the upper lip, with a larger median 

 lamelliform papilla above the maxillary suture ; a slight median 

 cleft in the upper lip ; maxillae at right angles to one another ; 

 horizontal teeth conspicuous. 



The total length of the body (without the caudal) is four and three 

 fifth times the length of the head ; the width of the head is consider- 

 ably greater than the height and two thirds of the length ; the height 

 of the body, which is equal to the width of the head, is one sixth of 

 the length. Scales on the body and tail are subequal and larger 

 than those on the neck and belly. The maxilla does not extend to 

 the vertical from the posterior margin of the eye, the diameter of 

 which is contained six and a half times in the length of the head and 

 twice in the interorbital space. The length of the pectoral is 

 greater than that of the head. The third, fourth, and fifth dorsal 

 spines are produced into long narrow ribands ; the fourth, which is 

 longest, is nearly three times the height of the body ; the second 

 dorsal is considerably higher than the body. Colour uniform 

 violet-brown, dorsal fins with irregular wavy dark markings ; anal 

 with a black and white marginal band ; caudal with a dark band on 

 the upper margin. 



Total length 4f inches. 



Hab. Barbadoes. 



One adult specimen. 



