340 REPORT OF COMMISSIONER OP FISH AND FISHERIES. 



Vineyard Sound!, Nantucket!, Provincetown!, and Nahant, Mass.! It 

 appears to be very rare, or perhaps does not occur in the northern part of 

 the Gulf of Maine, where it is replaced by the next species ; it reappears, 

 however, on the coast of Nova Scotia, having been collected at low 

 water by the U. S. Fish Commission in 1877, at Halifax! . It is usually 

 found on sand below high tide, or burrowing just under the surface, 

 but also swims with facility. 



Specimens examined. 



Chiridotea Tuftsii Harger (Stimpson). 



Idotea Tuftsii Stimpson, Mar. Inv. G. Manan, p. 39, 1853. 



Verrill, Proc. Am. Assoc., 1873, p. 362, 1874; This Report, part i, p. 340 



(46), 1874. 



Harger, This Report, part i, p. 569 (275), 1874. 



Chiridotea Tuftsii Harger, Am. Jour. Sci., Ill, vol. xv, p. 374, 1878; Proc. U.S. 

 Nat.Mus., 1879, vol. ii, p. 159, 1879. 



PLATES IV AND V, FIGS. 20-23. 



This species is distinguished from the preceding by its smaller size 

 and longer antennae, which are about twice as long as the antennulaa 

 and bear a slender flagellum. The eyes are also more conspicuous than 

 in Ch. cceca. 



The head is excavated in front above the bases of the antennte; and 

 the incision in the produced lateral margin is nearly closed by the over- 

 lapping of the anterior lobe. The antennulse (pi. V, tig. 23 a) are slender 

 and do not surpass the peduncle of the antennae, the second segment 

 as well as the third is cylindrical, and the last segment bears about 

 nine tufts of short hairs; the peduncular segments bear also a few 

 bristles. The antennas (pi. V, fig. 23 b) have the first segment short ; the 

 second, third and fourth about equal in length and more than twice as 

 long as the first; the fifth as long as the third and fourth together, 

 but more slender and cylindrical ; the flagellum longer than the pedun- 

 cle, composed of about twelve segments and tapering from the base. 

 The maxillipeds (pi. IV, fig. 21) have the external lamella (e) longer 

 than broad. 



The first pair of legs (pi. V, fig. 23 c) are somewhat less robust than in 

 Ch. cceca. They are a little shorter than the second and third pairs, and 



