162 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



Livoneca ovalis White, List Crust. Brit. Mns., p. 109, 1847. Cymotlioa ovalis Say, 

 Jour. Acad. Nat, Sci. Phil., vol. i, p. 394, 1818. 



White and several other British carcinologists use the orthography 

 Lironeca; but in the Dictiounaire des Sciences naturelles, tome xii, 

 where the genus is established by Dr. Leach, the name occurs, in French 

 and Latin, nine times on pages 352 and 353, spelled always with v as the 

 third letter. I have, therefore, adhered to that orthography, although 

 there is reason for supposing that Dr. Leach intended to use the form 

 Lironeca. 



Parasitic on Bluefish, etc.; not yd found north of Cape Cod. 



Aiithura polita Stimpson, Pnsr. Ac:nl. Nat. Sci. Phil., vol. vii, p. 393, 1 -.'-". Aiillntra 

 In-ii ii ncii Hariici-, Rep. U. S. Fish Com., part i, p. f>72 (~7S). 1-7 i. 



A southern species, not found north of Cape < 1 od until the summer of 

 1878, when it was taken at C.loiicester, Mass. Usually found among 

 Eel-grass or mud in shallow water. 



Paranthura brachiata = Ant hnr, t linn-liialu Stiiupson, Mar. Invert. Grand Manan, p. 

 4:;, l-r.:5. 



A northern species, but found as i';ir south as Vineyard Sound, from 

 27 to 1 15 fathoms. 



Ptilanthura tenuis Harbor, Am. Jour. Sci., Ill, vol. \v. p. '.',". 1-7-. 



Uare. lint found tliroughout the^'ew Kngiand coast. The remarkably 

 elongate ilagellum of the anteimula 1 belongs to the males only. 



Guatllia cerina= rr<mi:<i omi ;ison. Mar. Invert. <;rand Manan, p. I'.', pi. iii, 



i\g. '.'<\. r-.V!: and. ;iNu. .Im-cii* . Inn riciiiin* Si inip>oii. up. cit., p. 1'J. !-.">:',; the 

 I'm in. T l>ciiiLC tin- female t'unu and tin- latter that of tin- adult male. 



A northern species, not yet found south of Cape Cod, occurring in 



from 10 to 220 fathoms, and, in the young stages, parasitic on lish. 



Taiiais vittatus Lill.jelior.Lr. r.itli-a- til Kiinn. Crn t. Tanaid.. p. '-".. L865.- -CrOMurus 

 rillniiix K'athUc, Fauna .\nr\\ r u viis. i Nnva Aita Acad., vol. x\, I p. :'.'.'. ]il. i, li-s. 

 1-7, L843. 



This species has been found at Xoank Harbor. Conn., and will proba- 

 bly be found at other localities on our coast. 1 have had no European 

 specimens for comparison, and, unfortunately, have nor had access to 

 sonic important European literature on the subject, but do not know of 

 any character by which to distinguish it from Kathkc's .species, and have 

 therefore regarded it as identical. 



This genus is well separated from the next by the pleon. which bears 

 only three pairs of pleopods anduniramous uropods, and by the remark- 

 able, incubatory sacs attached to the fifth thoracic segment of the 

 femah-s. mid unlike anything else found among the Ixop<><la. They have 

 been described by llathke, \Villemoes-Suhin, and others. 



Leptochelia algicola = Par(ttanais algicola Harder, Am. Jour. Sci., Ill, vol. xv, p. 377, 

 ]-~,~. I,cj'il<>c1i,'li,t L'llu-tirdxii liatr and West wood, I'.rir. Scss. ( 'rust., vol. ii,p. 

 134, 1838, (males). Tanais ^?MwiHargcr. K-p. 1'. S. Fish Coin., part i, p. 573 

 (-279), 1874, not of .stinips.m. 



A male specimen, received from Guernsey, through the kindness of 



