CRUSTACEA FROM THE BAHAMAS 85 



Length of third pereiopod 13 mm. Breadth of chela 3 mm. The 

 fourth pereiopod shorter than third." 



I note the following peculiarities in my specimens : Dorsal surface 

 of rostrum with six teeth; the fourth and sixth have each a minute sub- 

 sidiary tooth. Ventral surface with a single, not very prominent tooth. 

 Both margins of the chelae of the third pereiopods very finely serrated, 

 a'rather prominent keel on the upper margin. The third pereiopod of 

 the right and left sides similar. Telson spiny. The large specimen 

 (s) is 15 mm. long, the $ slightly smaller. Length of chelae in ? 

 6 mm., breadth 2.5 mm. 



Not having the opportunity of comparing the Bahama specimens 

 with Von Martens' type I prefer to consider these slight variations as 

 possibly due to imperfect description, and to place my specimens, 

 provisionally, at least, with Von Martens' species. 



S. semilcBvis differs from 5. hispidus mainly in the teeth of rostrum, 

 the shorter rostrum, the proportionately shorter and thicker hand, the 

 less spiny carapace of cephalo-thorax and the smooth abdomen. 



52. Stenopus scutellatus n. sp. (PI. xxix. Fig. 3) 



(o) I ( ?) $ . Under coral, near low water. Silver Cay, N.P. 



Total length from tip of rostrum to tip of thorax 18 mm. Length 

 of rostrum 3 mm., of cephalo-thorax 7 mm. 



Rostrum has a single row of ten spines on median dorsal line ; back 

 of the tenth a double row of three spines extend to the cervical furrow. 

 On median ventral line of rostrum are six spines ; no lateral spines on 

 rostrum. Rostrum longer than in S. hispidus, extending beyond the 

 peduncle of inner antennae. Whole surface of carapace covered with 

 delicate spines obscurely arranged in rows ; usually curved forward, 

 with a somewhat reflexed tip. Spines on dorsal surface of first two 

 abdominal segments short and straight in a double row pointing for- 

 wards; on third segment several rows, stouter, pointing outwards; 

 on the fourth, fifth, andsixthsegments spines are longer, pointing back- 

 wards. In the middle of the posterior portion of the tergum of the 

 third abdominal segment there is a polished, slightly elevated, shield- 

 shaped area, with crenellated margins, about i mm. in length. The 

 median tergal region of fourth segment is smooth and polished, sur- 

 rounded by a row of appressed spines, the same being true to a less 

 extent of the fifth segment. I have taken the specific name from this 



