54 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Holmes found the species in the mud at Woods Hole, Massa- 

 chusetts, and off Nobska at the same place. In the Biological 

 Survey of Woods Hole this species was dredged in 4 to 13 

 fathoms on bottoms of sand and gravel. It has also been collected 

 within Connecticut at Noank in mud and grass ; off Stonington ; 

 Long Island Sound. 



According to Holmes, the species has the habit of lying very 

 quiet for a long time with its body strongly flexed and of starting 

 quickly when disturbed and swimming vigorously for a time and 

 then coming to a sudden stop with its body flexed as before. 



Tmetonyx Stebbing. 



Epistome more or less projecting and rounded in front. 



Antennae with small calceoli in male. 



Mandibles with large molar tubercle, obliquely truncate, with 

 palp attached dorsal to it, second and third joints of palp sub- 

 equal. First maxillae with two setae on inner plate ; outer plate 

 broad and obliquely truncate; palp with several spine teeth 

 apically. Second maxillae with inner plate smaller than outer. 

 Maxillipeds with outer plates large, oblong oval, reaching as far 

 as second joint of palp which is not very robust. 



First gnathopods slender with propodus oblong and palm very 

 oblique and rather indistinctly defined. Second gnathopods with 

 ischium greatly elongated; propodus not at all produced beneath 

 the minute dactyl. First pereiopods elongate, with large basal 

 joint. 



Third uropods projecting beyond the second; rami minutely 

 denticulate. Telson oblong, deeply cleft. 



The name Hoplonyx by which this genus was formerly 

 known, was preoccupied as a coleopteran genus. 



Tmetonyx cicada (Fabricius). 



1891. Hoplonyx cicada, G. O. Sars, Crust. Norway, vol. i, 

 p. 92, pi. 32, fig. 2. 



1906. Tmetonyx cicada, Stebbing, Das Tierreich, Lief, 21, 



P- 74- 



Head with interantennal lobes only slightly projecting and 

 rounded. 



Eyes not very large, narrow above, broader below. 



