GLYPHOCRANGON SPINULOSA. 139 



the marginal spines there is an irregular longitudinal row of very small spin- 

 ules on each side of the rostrum. 



The carapace is thickly strewn with spinules which are laterally com- 

 pressed. Along six longitudinal lines on each side of the carapace the spines 

 are larger, more flattened laterally, forming interrupted carinas. The third 

 carina (reckoning from the dorsal line) ends anteriorly at the deep branchio- 

 hepatic sulcus. The fourth carina, on the contrary, is especially prominent 

 on the hepatic region, where it is broken up into two or three prominent 

 teeth. The two lowermost carina3 are obsolescent. The anterior margin 

 of the carapace is produced into a large external orbital spine directed 

 obliquely upward and outward. The hind margin of this spine or tooth is 

 armed with a variable number of spinules. The antero-external angle of 

 the carapace is produced into a strong spine directed downward and a little 

 outwai'd. 



The abdomen, like the carapace, is spinulose on the dorsum and pleura3. 

 An interrupted carina extends the length of the median dorsal line. On the 

 sixth segment this carina is tootlied along its edge. On the first segment, 

 on each side of the median carina, in line with the second carina of the cara- 

 pace, there is a prominent acute tooth directed obliquely forward. Tlie 

 pleuroe of the first segment are for the chief part converted into smooth 

 facets which lie beneath the next pleura3 when the abdomen is flexed ; their 

 free margins are unarmed. The second to the fourth pleural are armed infe- 

 riorly with two spines curved outward and backward, the anterior of the two 

 being tlie larger. The fifth pleuroe are hkewise armed with two spines, but in 

 this case the posterior spine is the larger. The sixth pleurjB end posteriorly 

 in a single spine directed outward at a greater angle than those on the ante- 

 cedent segments. The median dorsal carina of the abdomen is continued 

 along the basal part of tlie telson in the shape of a line of four or five teeth, 

 decreasing in size from before backward. On either side of the median dorsal 

 line there is a lateral carina which is spinous anteriorly, but entire toward the 

 tip. The lateral margins of the telson are sinnlarly carinated and spinulose. 



The eyes are very large and colored with a dark pigment. The antennal 

 scale is much shorter than the rostrum, ovate, its margins ciliated ; the me- 

 dian longitudinal rib is spinulose as well as the portion of the field lying 

 external to the rib. The lower side of the scale is also spinulose, although 

 in a less degree than the upper side. 



The dactyli of the fourth and fifth pairs of legs are lanceolate, compressed 

 vertically, concave above and convex below. 



