258 CARCINOLOGICAL STUDIES. 



genus, in which the lateral margins of the cephalothorax 

 are armed with an epibranchial tooth behind the 

 external orbital angle and in which the hands of the male 

 are not provided with pectinated ridges on the upper margin 

 of the palm , to a section which is represented in the indopa- 

 cific region by a number of species , whereas only two 

 species of that section are known to me as inhabiting the 

 American seas, viz. Sesarma crassipes Cano (1889) from 

 Pernambuco and Ses. sulcata Smith (1870) from the western- 

 coast of Nicaragua. 



As in the last-named species, the cephalothorax is much 

 broader than long, its greatest width (at the epibran- 

 chial teeth) being in proportion to the length as 5:4. The 

 upper surface is somewhat convex longitudinally, and, as 

 usual, declivous on the branchial regions. The interre- 

 gional grooves are almost wanting, for only those 

 bordering posteriorly the mesogastric and cardiac regions 

 are represented by shallow depressions. The declivous bran- 

 chial regions are traversed by the ordinary sharp , pubes- 

 cent elevated lines, but for the rest the upper surface of 

 the cephalothorax is smooth and even shining, 

 though it appears distinctly punctate, even to the na- 

 ked eye. Rather large impressed points indeed are found on 

 the gastric and cardiac regions, especially on the protogas- 

 tric lobes, but the whole upper surface appears moreover 

 very finely punctate when seen under a magnifying glass 

 and then also a few very small tufts of hairs are observed, 

 distributed over the whole upper surface. The front is a 

 little broader than half the width of the cepha- 

 lothorax and very obliquely deflexed; the four postfrou- 

 tal lobes, the internal of which are somewhat broader than 

 the external, are very little prominent, so that the 

 front is entirely visible when the cephalothorax is looked 

 at from above; they are moreover only separated from one 

 another by very slight grooves, of which the mesial fron- 

 tal furrow is a little more distinct, bifurcating itself, as ordi- 

 narily , in order to border the anterior lobe of the mesogastric 



Notes froin the Leyden Museum, "Vol. XIV, 



