K 



172 CALIFORNIA ACADEMY OF SCIENCES. 



Crangon franciscorum St. 



Crangon franciscorum Stimpson, Proc. Cal. Acad. Sci., Vol. I, 1856, p. 89; 

 Journ. Bost. Soc. Nat. Hist., Vol. VI, 1857, p. 495, PL XXII, fig. 5. 

 KiNAHAN, Trans. Roy. Irish Acad., Vol. XXIV, 1862, p. 47; Proc. Eoy. 

 Irish Acad., Vol. VIII, 1864, p. 68. Cooper, Kep. Expl. and Sur. Pac. 

 Ocean, Vol. XII, Book 2, 1860, p. 388. Kingsley, Bull. Essex Inst., 

 Vol. IX, 1877, p. 54; Ibid., Vol. XIV, 1883, p. 129, PI. I, fig. 7. Rath- 

 bun R., The Fisheries of the U. S., Sec. I, 1886, p. 818. Sharp, Proc. 

 Acad. Nat. Sci. Phila., 1893, p. 125. Ortmann, Ihid., 1895, p. 181. 



Near nigricauda but more slender; the number and position of the 

 thoracic spines are the same as in that species and the rostrum has almost 

 the same form. Flagella of the antennules markedly unequal, the inner 

 much exceeding, the outer not reaching the tip of the acicle. The antennae 

 nearly equal, or slightly exceed the length of the body; acicle narrow, 

 about three-fourths the length of the carapace, with the antero-internal 

 angle rounded and not produced beyond the spine at the outer angle. 

 Maxillipeds scarcely reaching so far forwards as the tip of the acicle. 

 Chelipeds more slender than in nigricauda; merus with a spine near the 

 middle of the lower side; hand narrowly oblong, more than three times 

 as long as broad, slightly wider and more inflated near the base; the mar- 

 gin against which the finger closes long, convex, and nearly longitud- 

 inal; the spinous pollex projects nearly transversely. The remaining 

 pairs of legs similar to those of nigricauda. A well developed sternal 

 spine. Antepenultimate abdominal segment rounded above, not at all 

 carinated, with a pair of small spines at the posterior margin at the supero- 

 lateral angles; sixth segment rounded, and devoid of a carina or groove 

 above, sulcate below, with the spines at the posterior end the same in 

 number and position as in the preceding species . Telson rounded, not 

 grooved above, and tapering to an acute tip. Uropods as in nigricauda, 

 generally slightly exceeding the telson. 



Color " dark and light yellowish gray mottled. Eyes salmon-colored in 

 life." 



Length, 54 mm.; length of cheliped, 18 mm.; of hand, 8 mm.; of 

 antennal scale, 11 mm.; of carapace, 14.5 mm.; width of hand, 2 mm. 



Paget Sound; Shoal water Bay (Cooper); Tomales Bay 

 and Monterey (Stimpson); San Francisco Bay (Stimp- 

 son)! 



This shrimp is very common in San Francisco Bay, 

 where it is caught in large quantities for the markets. 



