60 University of California Publications in Zoology [Vol. 23 



made at a depth of 29 to 40 fathoms, in close correspondence with its 

 known bathymetric range (see Distribution above). The bottom at 

 the first two of these stations was "very fine, dark green sand," at 

 the last one practically nothing but "refuse and garbage." The 

 range of bottom temperature at these stations was 9.6° to 9.8° C ; 

 the range of salinity, 34.2 to 34.3. 



Spirontocaris franciscana sp. nov. 



Plate 12, figures 8 and 9 



Description. — Rostrum about one-fourth longer than the carapace, only slightly 

 exceeding the antennal scale ; armed above with five teeth, the last of which is 

 situated on the carapace, while the most anterior is slightly more than one-third, 

 about two-fifths, the length of the rostrum from the tip; armed below with six 

 to seven teeth, the most anterior of which is the smaller and is situated imme- 

 diately behind the acute tip, thus giving the rostral extremity a bifid appearance. 

 The suborbital angle of the carapace is prominent and the antennal spine is well 

 developed, but there is no trace of a pterygostomian spine. 



Thinner flagellum of the antennules exceeds the blade of the antennal scale 

 by as much as the blade exceeds the spine; thicker flagellum extends four-fifths 

 the length of the antennal scale; basal scale of antennules not reaching beyond 

 proximal margin of the first segment of the peduncle/ Antennal peduncle reach- 

 ing about as far forward as the antennular peduncle; antennal scale (measured 

 along outer margin) about equal to the carapace in length. 



The maxillipeds about reach or just fall short of the middle of the antennal 

 scale. First pair of feet reach as far forward as the eyes, the second exceed the 

 maxillipeds by the length of the hand, the third pair by about one-third the length 

 of their propodal joints, and the fourth pair by the length of their daetyli, while 

 the last or fifth extend only as far forward as the tips of the maxillipeds. This 

 species, like S. stylus, has an epipod but no exopod on the third maxilliped, and 

 has all the thoracic feet without epipods. 



Abdomen strongly geniculated at the third segment, which is more or less 

 evenly rounded above ; sixth segment shorter than the telson ; telson with four 

 to six pairs of lateral spinules. 



Dimensions. — Type (Cat. No. 50439, U. S. N. M.), ovigerous female: length 

 46 mm., of carapace and rostrum 17 mm., of rostrum 10 mm. 



Color. — "Plain reddish brown (pale)." Taken from the label of a specimen 

 collected by Prof. W. A. Hilton at Laguna Beach. 



Type Locality. — San Francisco Bay ("Albatross" station D 5770). 



Distribution. — San Francisco Bay and Laguna Beach, California, 2% to 7% 

 fathoms. 



Remarks. — This species is close to Spirontocaris stylus of Stimpson (see Rath- 

 bun, 1904a, p. 84, for description), and like it lacks a pterygostomian spine, but 

 differs, however, in that the teeth of the dorsal margin of the rostrum extend 

 forward onto its distal half; the rostrum too, is shorter, and the antennal 

 peduncle longer in S. franciscana, which also, withal, is the stouter and more 

 robust species of the two. 



One of the San Francisco Bay specimens (the single one taken at D 5778) 

 has the anterior dorsal tooth at the middle of the rostrum, and did it not 

 coincide so closely in all other points, I should be inclined to doubt its identity. 



