CETJSTACEA 01" THE MEEGTJI AECHIPELAGO. 139 



As iu Dotilla, the cephalothorax is more enlarged above the 

 bases of the legs than at its upper surface ; and it is rather 

 thick, though not globose. The upper surface is broader than 

 long, the proportion of the greatest width, which is found a 

 little behind the middle, being to the length (the front included) 

 as 7:5. The upper surface is rather flattened, being only 

 slightlj declivous towards the front, towards the postero-lateral 

 angles and behind a straight elevated transverse line which pro- 

 ceeds at a short distaDce from, and parallel to, the posterior margin 

 between the bases of the last pair of legs. The posterior 

 margin is slightly concave in the middle, and its lateral angles 

 are rounded. 



The upper surface is smooth and almost glabrous, presenting 

 only a few scattered short cilia on the postero-lateral regions ; 

 the remarkable grooves of the genus Dotilla are quite wanting. 

 Besides the broad, though shallow, longitudinal median furrow 

 of the front, some interregional grooves are faintly indicated. 

 Thus an impressed transverse line, interrupted in the middle, 

 lies quite on the middle of the cephalothoras, and this I regard 

 as the ordinary transverse groove which separates the gastric 

 from the cardiac region ; behind this groove a second is some- 

 times observed, situated as far from the transverse line above 

 described as the latter is distant from the posterior margin 

 of the cephalothorax. This second impressed line is apparently 

 tbat which separates the anterior cardiac region from the poste- 

 rior. The branchiocardiac grooves are shallow and very faintly 

 marked^ Though the upper surface is smooth and flattened, it 

 appears, bowever, somewhat uneven on the branchial regions, 

 owing to the occurrence of four or five small prominences, the 

 posterior of which is a little more distinct than the others, and 

 assumes the character of a small short transverse tubercle lying 

 close to the base of the legs of the last pair, near the postero- 

 lateral angles of the upper surface. Two slight transverse 

 prominences are also observed on the anterior cardiac region. 



The front is a little broader than in the species of the genus 

 Dotilla, measuring between the eye-peduncles about a fourth 

 of the distance between the external angles of the orbits. The 

 anterior margin is slightly triangular, being a little prominent 

 and subacute in the middle, whereas the lateral angles are 

 rounded. The front is rather much declivous, and presents a 

 broad, though shallow, longitudinal median furrow. The orbits 



