SQUILLOIDEA.* 



4-6 dentibus obtusis, inter has et proximas quatuor rotundatis. Ap- 

 pendix caudalis dorso 5-spinosus. 



Antennary segment above a little oblong and rounded in front, outer 

 side with a prominent spine. Eyes small, subreniform, peduncle 

 subcylindrical, with a prominent spine on outer side of base. Cara- 

 pax with five costae, anterior angles acute but not much produced. 

 Lateral margins of three posterior segments of thorax entire, preced- 

 ing segment acute on either side. Finger of larger chela six-spinous 

 (terminal spine included). Abdomen with eight costae; the costse of 

 the four anterior segments not acute behind, six of the fifth segment 

 acute, and all of the sixth segment. Caudal segment with a median 

 acute ridge, and surface either side neither .sulcate nor punctate. 

 Margin with eight prominent acute spines, and between the two 

 median, four to six rounded teeth ; between those and the next, 

 four rounded teeth. Caudal appendage with five spines on dorsal 

 margin (the apical included). 



Plate 41, fig. 2 a, animal, natural size ; b, part of hand of larger 

 pair. 



Rio Janeiro. 



. 



Length, six inches. Colour, green, more or less clouded with yellow 

 and passing into blue ; margin of abdomen either side, white ; linear 

 ridges of carapax and abdomen, carmine ; extremity of large hand, 

 blue, and basal joints, green. Of the five costae of the carapax the 

 inner and two outer are nearly as long as the carapax ; the latter are 

 near the lateral margin of the carapax ; the middle one is not distinctly 

 furcate near the front. The inner of the spines of the finger is hardly 

 half as long as the next. The hand has three moveable spines near 

 its base, the median half as long as either of the others ; the upper 

 edge is evenly denticulate ; the carpus has a short obtusish tooth at 

 apex ; the arm is obtuse and rectangulate at lower apex. The eyes 

 are rather shorter than the first of the basal joints of the inner an- 

 tenncc; and the last of these basal joints is the longest. The small 

 epimeral piece of the first abdominal segment is flat and has its surface 

 nearly bisected obliquely by a straight slender ridge. 



Tliis species is near Squilla dubia. 



