472 KEPORT OF COMMISSIONER OF FISH AND FISHERIES. 



evident. Oculiferous tubercle large and rounded. Eyes black. Abdo- 

 men rather large, tapering, truncated, and slightly bifid at the extremity; 

 it usually projects vertically upward. 



Eostrum very large, rounded-conical, little constricted at the base, 

 somewhat shorter than the body. 



Antenna rudimentary, consisting of a single knob-like joint, which 

 is thinly covered with hairs. 



Palpi slightly longer than the rostrum ; the first, second, fom-th, and 

 fifth joints are nearly equal, and about as long as broad ; the third and 

 sixth are nearly equal, and about twice the others. The outer joints are 

 somewhat hairy, the terminal one most so. 



Accessory legs about half as large in the female as in the male. lu 

 the latter the basal joint is somewhat swollen and about as long as 

 broad. The second, fourth, and fifth are nearly equal, and longer than 

 the third ; the remaining joints are short, decreasing in size to the last, 

 which is very small. In the male the proportions are nearly the same, 

 but the third joint is proportionally longer, and all of the others are 

 more robust. The three outer joints are nearly globose, the terminal 

 one minute. This joint bears, in both sexes, two spines, one of which 

 is sometimes bifid at the tip. Other spines occur on the four preceding 

 joints and are sometimes bifid. 



Legs rather stout, sparsely hairy, the fifth and sixth joints having, 

 above, alternate depressions and elevations, producing a deeply sinuous 

 outline ; each of these elevations bears a number of hau-s. The three 

 basal joints are very stout and short; the three following are each 

 about equal to the three basal joints united ; tarsus nearly triangular, 

 with two or three stout spines below ; propodus strongly curved, with a 

 series of stout curved spines on the lower margin, on the upper side 

 hairy; dactylus more than half the propodus, stout and curved; auxil- 

 iary claws about half as long as the dactylus. 



Color of alcoholic specimens light yellowish brown. Length 1,5 milli- 

 meters ; extent 0,4 millimeters. 



The egg-masses are three or four in number and of a light yellow color. 

 In some specimens the embryos had escaped from the eggs ; they closely 

 resemble those of Aclielia, described on p. — , and the antennse are large 

 and chelate. 



This genus, recently described by Miers from specimens collected at 

 Kerguelen Island, is interesting fi'om the extreme reduction of the an- 

 tennae, thus offering a transition from the Achelidw to the Pasithoidce. 



T. orhlculare extends from off Martha's Vineyard to Virginia; it is 

 almost invariably found upon Hydroids or Ascidians growing on piles 

 of wharves, etc., and down to 14 fathoms. 



