CRUSTACEA OF THE MEEGTJI AKCHIPELAflO. 243 



(or median frontal tooth) is small, triangular, depressed, narrow 

 and subacute, but projects nevertheless a little more forwards 

 than the lateral frontal teeth, which are triangular and obtuse. 

 The external angles of the anterior margin of the cephalothorax 

 are rounded. Immediately behind the frontal margin a transyerse 

 groove is seen close and parallel to it, bordering anteriorly the 

 gastric region. 



The eye-peduncles are very slender and distinctly longer than 

 the breadth of the anterior margin of the cephalothorax, being 

 almost twice as long as the distance between the two lateral frontal 

 teeth. The cornea is small, scarcely measuring a twelfth of 

 the length of the peduncle : but in younger specimens it is com- 

 paratively larger. The ophthalmic scales are narrow, dilated at 

 their bases and armed at their distal ends with three or four 

 acute teeth. The peduncles of the internal antennae in the 

 adult are scarcely longer than the eye-peduncles. The antennal 

 peduncles are a little shorter than the eye-peduncles and their 

 penultimate and antepenultimate joints are hairy, the latter 

 joint being armed above at its outer angle with a hairy spine, 

 which projects a little beyond the anterjor end of the penultimate 

 joint. The terminal joint is about as long as the two preceding 

 taken together and is a little compressed. The flagella of the 

 outer antennsB are naked. 



The abdomen has the ordinary structure and form. The 

 uropoda are asymmetrical and hairy along the margin of their 

 terminal joint ; the left is the larger. The external foot-jaws are 

 about as long as the internal antennae. The anterior legs are 

 equal, and resemble those of Clibanarius longitarsis, de Haan. 

 The slightly arcuate upper margins of the arms are unarmed and 

 entire ; the external margins of their under surfaces are armed 

 at their distal ends with two small acute teeth, but their inner 

 margins are unarmed and entire. The outer surfaces of the arms 

 are covered with many short and small piliferous lines, their 

 inner surfaces are nearly smooth and glabrous ; and the smooth, 

 unarmed under surfaces bear a few small tufts of yellow hairs. 

 Similar hairs are also observed on the under surfaces of the basi- 

 podites and ischiopodites ; their upper margins present also 

 small transverse tufts of similar hairs. The upper margin of the 

 wrist is armed, at its distal end, with a small, acute, dark-pointed 

 spine, which is sometimes accompanied by a still smaller spinule 



16* 



