DECAPOD CRUSTACEANS OP THE BEAUFORT, N. C, REGION. 



383 



Length, 12.5 mm.; carapace, 4 mm. 



One specimen which agrees closely with Couti^re 's description and figures was taken by the Fish 

 Hawk on the fishing banks (station 7956) in 16 fathoms. 



This is unquestionably the Alpheus minus of Say and is almost equally certainly not the Alpheus 

 minus of Kingsley, Brooks, Herrick, and others whose papers are commonly listed in the synonomy of 

 the species. These authors, beyond any reasonable doubt, applied the name to the species now known 

 as Crangon packardi, which is, as they stated, common in Beaufort Harbor, true Synalpheus minus, 

 on the other hand, is not common anywhere in the region, and it is doubtful if it ever occurs in the har- 

 bor. It has been recorded by Couti^re from farther south and is probably the species recorded by 

 Smith <i from off Cape Hatteras, in 16 fathoms. 



Synalpheus longicarpus (Herrick). PI. xxvi, fig. 2. 



^H^ 



Alpheus saulcyi var. longicarpus Herrick, in Brooks and Herrick, 1892, p. 383 (part). 

 Synalpheus longicarpus Couti^re, 1909. p. 53. 



Carapace about two-thirds as long as abdomen, subcylindrical, and smooth; crossed by a very faint 

 cervical groove; frontal border produced into a sharp-pointed lobe above each eye,- rostrum carinate, 

 slender and slightly longer than supra-orbital lobes. 



Abdomen smooth, tapering ; telson with strongly con- 

 vergent, sinuous sides and truncate tip which bears four 

 slender spines, upper surface with four strong movable 

 spines; sixth segment and basal article of uropod with flat 

 marginal spines. 



Eyes small . Basal article of antennule with a spine 

 on outer margin which does not reach to the end of the 

 article. Basal and second articles of antenna each with 

 a strong, acute, forwardly directed spine, of which the 

 tip of the one on the second article exceeds the other 

 and extends a little beyond the base of the third article 

 of the antennule. Chelipeds very unequal, the smaller 

 one with a conspicuous brush of curled hairs on the mov- 

 able finger; the larger one cylindrical, with short fingers 

 of which the movable one is much the larger and strongly 

 curved. Second pair of legs with the carpus subdivided 

 into five articles which have approximately the propor- 

 tions of 4, I, I, I, 2. 



Length, 22 mm.; carapace, 9.5 mm. 



Color, a translucent milky white; the tip of the large 

 chela brown. 



Many specimens of this snapping shrimp have been 

 collected from the interior of sponges thrown upon the 

 shore by the waves. On the fishing banks it is probably 

 the commonest member of the genus, often occurring in enormous numbers in the large sponges which 

 are to be obtained in that locality. In August, 1915, such a sponge about 2 feet in height, belonging 

 to the genus Spirastrella, was brought in by the Fish Hawk. When cut open its larger canals were 

 found to be full of S. longicarpus, several hundred of which were saved before the patience of the 

 collector was exhausted . A considerable number of these shrimps were found to be infested with isopod 

 parasites, one a species of Phryxus being attached to the lower surface of the abdomen, while the other, 

 a species of a new genus, Synsynella,^ was an inhabitant of the branchial chamber. 



a Smith, Sidney 1.: Report Commissioner of Fisiieries for 1885, p. 54. 



b Phryius subcaudalis Hay and Synsynella»de/ormans Hay, Froc. U. S. Nat. Mus., 41, pp. 569-572, 1916. 



Fig. 6. — Synalpheus longicarpus. After Couti^re. 



Front of carapaceand appendages of female; fr.sameot 

 male; c, large ciiela; d, fingers of small cheliped; e, one 

 of the second pair of legs ;/, distal end of telson ; g. telson. 



