44 BULLETIN OF THE 



tened above, triangular but with the edge flattened and distally slightly grooved 

 below, and tapers regularly to an acute and gently upturned tip ; above there 

 is a narrow but distinct median carina extending the whole length, and the 

 margins are carinated and each armed just above the front of the eye will) a 

 prominent and acute spine directed forward and upward ; below the rostrum is 

 unarmed. Just back of the base of the rostrum there is a pair of spines like 

 those upon the rostrum, but slightly larger and with the bases elongated and 

 laterally compressed. From these teeth two parallel dorsal carina) extend to 

 the posterior margin, but each one is broken into ten or eleven elongated teeth 

 turned slightly forward, truncated above, and all except the first and last with 

 flattened and conspicuously punctate tops. The space between these carina) is 

 concave with a deep transverse depression at the cervical suture, but smooth 

 except a few small tubercles along the carina? and one on the median line in 

 front. The frontal margin is transverse and nearly straight, but the lateral 

 angle is armed with three very large and acute spines : a very slender antennal 

 spine directed upward and forward from just above the base of the antenna ; 

 directly below thi* 3 a somewhat larger one (the lateral angle itself) slightly 

 compressed laterally and curved downward and then directed forward below 

 the antennal scale ; and, arising outside and a little back of these, a very 

 broad, dentiform, vertically compressed spine directed outward and forward, 

 terminating in an acute tip as far forward as the tip of the antennal spine, and 

 apparently representing the anterior part of the lower of the three lateral 

 carina), but separated from it by the broad and very deep depression of the 

 cervical suture. The broad triangular space between this carinal tooth and the 

 gastric region is depressed and smooth. The posterior part of the middle lateral 

 carina is prominent and terminates at the cervical suture in a long tooth directed 

 forward ; posteriorly it extends to the posterior margin and has the edge thick, 

 flattened and punctate. The upper of the lateral carina) is not evident in front 

 of the cervical suture, is less conspicuous than the dorsal, and is obscurely 

 divided into about four truncated teeth flattened and punctate above. On 

 the gastric region in front of this carina there is an irregular group of elongated 

 tubercles extending to the gastro-orbital suture, but with this exception the 

 sides of the gastric region are unarmed, as are the remaining spaces between 

 the carina) of the dorsal part of the carapax, except a few very small tubercles 

 either side of the cardiac region, and a few still smaller ones below the upper 

 lateral carina and near the posterior margin. The lower of the lateral carina) 

 is broad, punctate along its edge, and extends from near the base of the spine of 

 the antero-lateral angle almost to the posterior margin, with a broad and deep 

 interruption at the cervical suture. On the branchial region below this carina 

 there are about three irregular elongated and punctate ridges, and near the 

 posterior margin there are a few small tubercles, but with these exceptions the 

 branchial regions are unarmed. There is, however, a narrow but well-marked 

 carina the whole length of the lateral margin. 



The eyestalks are slender and very small in proportion to the eyes them- 

 selves, which are approximately spherical, slightly compressed vertically, and 



