F. R. C. Reed— New Crustacea, Isle of Wight. 119 



angles somewhat produced backwards and pointed, and with a narrow 

 rounded tuberculate ring marked off by a smooth furrow. 



Cephalic portion of carapace gently convex between lateral carinae, 

 which converge anteriorly and end just outside base of rostral teeth. 

 Lateral carinae marked by specially large tubercles posteriorly, 

 decreasing in size anteriorly. Median portion of cephalon gently 

 swollen into obscurely defined sub-lanceolate pre-gastric area passing 

 back imperceptibly into gastric region, which is marked in front by 

 a pair of specially large tubercles situated rather behind the middle of 

 the cephalon. Gastric region narrow, somewhat depressed, oblong 

 defined on each side by irregular row of rather large tubercles running- 

 back to cervical furrow. A weak depression lies on each side of the 

 anterior pair of gastric tubercles and is prolonged outwards into 

 a weak furrow curving slightly back to the point where the cervical 

 furrow crosses the lateral carinae. Rostral teeth triangular (im- 

 perfectly preserved), separated by sharply rounded notch, with their 

 faces flattened and inclined inwards. A narrow indistinct post- rostral 

 ridge, marked by a few large tubercles, decreasing in size posteriori}*, 

 runs back from the base of each rostral tooth to the depressions 

 (hepatic) on each side of the gastric region. Anterior edge of lateral 

 portions of carapace not preserved. Sides of cephalon posteriorly bent 

 down at right angles to upper surface along lateral carinae. 



Surface of cephalon ornamented with sharply pointed, conical 

 tubercles smaller and fewer than on thorax and less closely placed, 

 but tending to be arranged in longitudinal lines especially towards 

 the lateral carinae. 



Thorax horizontally extended and flattened dorsally between lateral 

 carinae, with median portion somewhat elevated and provided with 

 median longitudinal keel bearing a row of specially large, sharply 

 conical tubercles. Lateral portions of thorax bent down at right 

 angles to upper portion without the formation of definite lateral 

 carinae posteriorly, but anteriorly towards cervical groove the angular 

 J.ine of bending is marked by definite line of large conical tubercles. 

 Sides of thorax decrease in height posteriorly owing to lateral 

 line of bending curving down behind. Cardiac region gently 

 elevated and defined by pair of weak smooth furrows, gently curved 

 outwards and reaching two-thirds the length of the thorax ; width 

 of cardiac, region across middle about one-third that of thorax. 

 Anterior margins of thorax swollen slightly on each side behind and 

 along cervical groove into a low rounded ridge, widening a little 

 laterally to the lateral carinae against which it ends. 



Surface of thorax covered with large, sharply pointed, conical 

 tubercles, mostly of equal size and closely placed, but not in any 

 determinable order ; on the sides these bases are nearly or quite 

 contiguous. Both the large tubercles on the carinae and those on the 

 general surface of the carapace have their sharp points slightly arched 

 and directed forwards. 



Abdomen strongly arched from side to side (five segments pre- 

 served) ; tergum with general surface flat, and with a thin median 

 longitudinal keel; shell covered with small equal-sized numerous pits. 

 Inferior lateral edges of terga somewhat thickened. Epimeres of 



