1921] Schmitt: The Marine Decapod Crustacea of California oi 
Spirontocaris lagunae sp. nov. 
Plate 12, figures 10 and 11 
// 
Fig. 35. Spirontocaris lagunae, 9, mandible, much enlarged. 
Description—Carapace about one-half as long as abdomen, exclusive of telson; 
surface with small, scattered tufts of setae. Rostrum very small, reduced to a 
mere spiniform tooth; supraorbital spine well developed, prominent, reaching 
beyond the frontal margin of the carapace by about half the length of the eye- 
stalk; behind the rostrum the carapace is more or less carinated, carina bearing 
three teeth on anterior half of carapace, and fading out toward posterior margin; 
of these teeth the median is much the largest, being about twice the size of the 
other two, which are subequal; posterior tooth at about the middle of the carapace; 
anterolateral margin with subocular, antennal and branchiostegal spines. An- 
tennular peduncle reaching forward about half the length of the antennal scale, 
flagella attaining its extremity; antennal peduncle about as long as or slightly 
longer than antennular peduncle. Mandible with incisor process and palp of two 
segments. Third pair of maxillipeds exceeding the antennal peduncle but falling 
short of the tip of the scale. Carpus of second pair of legs with seven segments. 
Propodi of ambulatory legs spinulous below, dactyls with five corneous spines, 
increasing in size to the last or terminal one; terminal spine and the one next 
adjacent subequal, making the dactyl appear biunguiculate. f 
First three abdominal segments laterally rounded; epimera of fourth somewhat, 
and fifth pronouneedly drawn out into a backward pointing, acute, spine-tipped 
process, armed on the posterior margin with a second spine a little distance above 
the first; postero-ventral angle of sixth segment prolonged into a strong, stout 
spine, above which, on the posterior margin, there is a much shorter, weaker one; 
on the ventral surface of this segment there is a blunt, conical tubercle, at about 
the anterior fourth of the median line; dorsal surface of telson with three pairs 
of spinules. 
Dimensions.—Type (Cat. No. 52711, U. S. N. M.), ovigerous female: length 
about 20 mm. 
Color.—Type, ‘‘kelp color’’ (Hilton). The label on two other specimens also 
collected by Prof. W. A. Hilton reads: ‘‘Body light, legs darker, red and 
black on appendages. ’’ 
Type Locality—Known only from two ovigerous females and one male speci- 
men dredged at Laguna Beach, California, by Prof. W. A. Hilton. Of these 
the male and one female were taken August 27, 1917, in 12 to 15 fathoms. 
