35 G REPORT OF COMxMlSSlONEK OF FISH AND FISHERIES. [12] 



Galacantha Bairdii, sp. nov. 



This species, which is represented by a single specimen (5717), is very 

 distinct from either of the species described by A. Milne-Edwards, and 

 readily distinguished by the long, slightly upturned, and laterally 

 spinous rostrum, by the number and form of the lateral spines of the 

 carapax, and by the terminal spines of the eye-stalks. In some of its 

 characters the species is more like Munidopsis than Oalacantha, and it is 

 possible that the genera should be united. 



Female. — The carapax is broadest at the branchial regions, very 

 slightly narrowed toward the front, and strongly convex transversely, 

 and the length of the lateral margin is a little greater than the breadth. 

 The anterior margins are oblique, and the front gradually narrowed 

 into a long, rather slender, and slightly upturned rostrum, armed along 

 the middle of either edge with three teeth directed outward and for- 

 ward. The antero-lateral angle is armed with a slender spiniform tooth, 

 turned forward, and back of this the lateral margin is armed with either 

 two or three spines : a large one on the front of the hepatic region and 

 slightly above the spine of the antero-lateral angle ; another, but much 

 smaller spine, just back of the first, on the hepatic region of the right 

 side only; and one, about as large as the antero-lateral, on the edge of 

 the branchial region, just back of the shallow cervical suture. There is 

 a pair of large spines on the front of the gastric region, a pair of smaller 

 ones nearer together on the posterior part of the gastric region, and be- 

 tween these two i)airs a pair of still smaller ones. The front of the 

 cardiac region is slightly elevated, and armed with a j)air of spines like 

 the posterior gastric, and just back of these there is a small median 

 spine. The raised posterior margin of the carapax is armed with four 

 or five small vertical spines either side. The surface of the branchial 

 regions is roughened with numerous short transverse rugai; other parts 

 of the surface are more or less granular or minutely" tuberculous, and 

 the whole surface of the carapax, pleon, and perseopods are more or less 

 thickly clothed with short hairs. 



The eyes are very much smaller than in G. rostrata and colorless in 

 the alcoholic specimen, and the eye-stalk is prolonged on the dorsal side 

 beyond the cornea in a slender horizontal spine as long as the diameter 

 of the eye. 



The stout first segment of tlie peduncle of the antenuula is armed 

 distally with five sharp spines, two above and three below the inser- 

 tion of the second segment. The second segment of the peduncle of 

 the antenna is armed with a triangular tooth below and a spiniform 

 tooth on the outer side; the third segment is armed with two spiniform 

 teeth situated as on the second segment ; the fourth with three large 

 spines above and two or three jninute ones beneath ; and the fifth or last 

 with two small teeth above. The llagella of the antennai are nearly as 

 in O. rostrata. 



The second gnathopods are nearly as in O. rostrata except the merus, 



