408 DR. J. G. DE MAN ON CEUSTACEA CHIEFLY 



agree with those of a female of Crangon vulgaris from this country. Thus tlie joints of 

 the endopodite are broader in proportion to their length. The terminal joint appears in 

 an egg-bearing female of Crangon vulgaris of the same size six times, but in the female 

 of Crangon cassiope five times as long as broad ; the penultimate segment of Crangon 

 vulgaris is a little more than four times, that of Crangon cassiope a little more than 

 three times as long as broad ; the antepenultimate joint, finally, is, in the common 

 shrimp, about four times, but in Crangon cassiope three times as long as broad. 



The first pair of feet (PI. 32 fig. 23), which reacli nearly to the end of the antennal 

 scales, are stouter than those of vulgaris ; the length of the chelae is only two and one- 

 third times the width measured from the inner base of the immovable spine, in Crangon 

 vulgaris, however, three times. The obliquity of the anterior margin is in both species 

 the same. 



The second legs are also a little less slender than those of the common shrimp. The 

 legs of the fourth pair reach with their dactyli beyond the tip of the antennal peduncles, 

 those of the fifth (fig. 2i) are but little shorter ; these legs differ especially from those of 

 Crangon vtdgaris by comparatively shorter dactyli (fig. 25) and somewhat slenderer 

 propodites. Eor example, the propodites of the fifth pair in an egg-laden female of 

 Crangon vulgaris of the same size as the specimens of Crangon cassiope are seven 

 times, but in cassiope eight times as long as broad ; the dactyli are in Crangon cassiope 

 half as long as the propodites, but in Crangon vulgaris they measure three-fourths the 

 length of these joints, appearing thus comparatively once and a half as long as in our 

 new species. 



The globular eggs are small, diameter 0*45 mm. 



SCLEROCEANGON, G. O. Sars. 



SCLEROCRANGON ANGTJSTICAUDA (de Haan). 



Crangon angusticauda, de Haan, Fauna Japonica, Crust. 1849, p. 183, tab. 45. fig. 15; Stimpson, in 



Proc. Acad. Nat. Sci. Philadelphia, 1860, p. 25. 

 Sclerocravgon angusticauda, Ortmaiin, in Spengel, Zool. Jahrb., Syst. v. 1890, p. 533, and in Proc. Acad. 



Nat. Sci. Philad. 1895, p. 179. 



One egg-laden female from the Inland Sea of Japan. 



Length 32 mm. from tip of rostrum to the end of the telson; the carapace, 8"75 mm. 

 long, the rostrum included, measures little more than one-fourth the whole length. 

 Viewed from above, the rostrum, which is as long as broad at its base, appears a little 

 shorter than the eyes ; its slightly upturned lateral margins, which in a lateral view of the 

 rostrum appear a little arcuate, curving at first upward and then very slightly downward, 

 converge forward, so that the rostrum appears triangvilar, with rather obtuse tip. 

 De Haan, however, describes the rostrum as " apice acutum." 



The obtuse, flattened, median carinse of the third to fifth abdominal somites are 

 bounded on each side by a hairy, longitudinal furrow, into which issues the transverse 

 furrow described by de Haan. The sixth segment carries above two obtuse carinas, which 

 converge backward and are even united for a short distance posteriorly ; between the two 



