56 PROCEEDINGS OF THE NATIONAL MUSEUM. tol. 53. 



ing of only the basal joints, without rami or setae; first three pairs 

 well armed with setae. 



These legs are arranged like those of medusaeus, the first and 

 second pairs close together, the second pair about opposite the cen- 

 ter of the posterior soft horns, the third pair at a greater distance 

 near the posterior margin of the third segment, the fourth pair 

 at a still greater distance near the posterior end of the fourth seg- 

 ment. 



Scattered chitin fragments which probably represent the origi- 

 nal thoracic sterna are found in the spaces between the legs. 



Color (preserved material), a uniform light yellow. 



Total length, not estimating the curves, G mm. Length of head, 

 including processes and horns, 2 mm. Length of trunk, 5 mm. ; di- 

 ameter, 1.15 mm. Length of egg strings, 1.50 mm. 



{hellottii. to the Milanese ichthyologist, C. Bellotti.) 



Internal anatomy. — The internal anatomy is very similar to that 

 of medusaeus, with the following differences. The chitinogen layer 

 is much thickened in the genital segment as well as in the anterior 

 thorax segments. There are the same large conical or funnel-shaped 

 pores in the outer skin, communicating with the inner chitinogen 

 cells. The ovaries are somewhat longer and wider while the oviducts 

 are not quite as wide, but the latter are still comparatively very 

 wide and are flattened laterally like those in medusaeus. The cement 

 glands are longer and reach in front of the anterior ends of the 

 oviducts; they are cylindrical and are not flattened. These specific 

 distinctions will supplement those already given under medusaeus^ 

 and may serve to establish the two species upon a more substantial 



basis. 



Genus LERNAEENICUS Le Sueur. 



Lernaea (part) SowERnY, Tueton, Buvinville, Cuvieb, etc. 



Lcrneocera (part) Blainville, Journ. de Physique, vol. 95, 1S22; Lemeocera 



surriraiis, third species, p. 376, a synonym for Lcrnaccnicus sprattae. 

 Lemeaenictis (part) Le Sueub, Jotirn. Acad. Nat. Sci., Pliiladelpliia, vol. 3, 



1824, p. 2S9. Type Lcrneocera radiata Le Sueur, second species. 

 Lernconema (part) Milne Edwards, Hist. Nat. des Crustaces, 1840, vol. 3, 



p. 524; L. monillaris, second species, p. 525, a synonym for Lcrnaeenicua 



sprattae. 

 Forocnlum Wm. Thompson, Cat. Museum College of Surgeons, 1843 ; Foro- 



culum sprattae, single species, a synonym of Lernaeeniens sprattae. 

 Lerneaenicus Fowler, Report New Jersey State Museum for 1911 (1913), 



p. 87. 



External generic characters of female. — Head not separated from 

 the thorax, in line with the body axis, or bent forward at right angles, 

 with a deeply buried tripartite eye over the base of the esophagus; 

 horns slender, cylindrical, chitinous, 2 to 10 in number, simple or 

 branched; anterior thorax enlarged through the bases of the swim- 



