66 



University of California Publications in Zoology [Vol. 23 



Dimensions. — Type: length 46.6 mm. 



Color. — Red (Owen). Almost transparent; red on the thorax, in one ease, 

 body streaked with brownish in another; still another with body violet and appen- 

 dages deep pink; in a fourth instance the body had a light pink tinge. 



Type Locality. — Monterey, California. 



Distribution. — San Francisco Bay, California, to Magdalena Bay, Lower 

 California. 



Remarks. — This species and the one following (S. brevirostris) are very similar 

 in general appearance and are undoubtedly closely related. They can always be 

 distinguished by the length of the antennal scale as compared with the telson; 

 it is always longer than the telson in S. palpator; it may be equal, but never 

 exceeds the telson in S. orevirostris, often falling short of it. S. brevirostris is 

 relatively the much stouter and more robust species of the two, attaining also a 

 much greater size. To emphasize these differences the following table, based on 

 four of the largest specimen^ of each species in the U. S. National Museum 



collections, is inserted. 













All measurements 

 in mm. 



Locality 



Length of 

 carapace 



Length of 

 abdomen 

 (over all) 



Length of 



third 

 maxillipeds 



Length of 



antennal 



scale 



Length of 

 telson 



S. palpator 



San Pedro 



8 



17 



12 



4 



3.5 



S. palpator 



Pacific Grove 



9 



19 



15 



5 



4.0 



S. palpator 



San Diego 



9 



19 



20 



5 



• 4.5 



S. palpator 



San Diego 



10 



21 



20 



6 



5.0 



S. brevirostris 



San Francisco Bay 14 



28 



37 



7 



7.0 



S. brevirostris 



Kadiak, Alaska 14 



30 



• 25 



7 



8.0 



S. brevirostris 



San Francisco 



Bay 15 



32 



31 



7 



8.0 



S. brevirostris 



Unalaska, Alaska 17 



35 



43 



8 



8.0 



In eleven of a series of fourteen specimens of S. palpator, the tip of the 

 rostrum had a simple ending, tip in one bifid and in two trifid. 



Spirontocaris brevirostris (Dana) 



Eippolyte brevirostris Dana, Proc. Acad. Nat. Sci. Phila., 6, 24, 1852; 



Crust. U. S. Expl. Exped., 1, 566, 1852, pi. 36, fig. 5, 1855. 

 Heptacarpus brevirostris Holmes, Occas. Papers Calif. Acad. Sci., 7, 198, 



pi. 3, figs. 50, 51, 1900. 

 Spirontocaris brevirostris Eathbun, H. A. E., 10, 99, 1904. 



Fig. 44. Spirontocaris brevirostris ; a, lateral view of carapace; b, acicle 

 (from Holmes). 



