19 21 ] Schmitt: The Marine Decapod Crustacea of California 71 



number of specimens per catch with the dredge being two and two- 

 tenths and for the tow-net three and five-tenths. The upper bay is 

 muddy like the lower bay and its single dredge and tow-net catches 

 exhibit a relation corresponding to that shown in the lower bay. 



The highest temperature prevailing at the time of making any 

 particular catch was 19.4° C (H 5216, upper bay) ; the lowest, 7.6° C 

 (H 5311, lower bay). The highest salinity recorded, 34.3, was 

 naturally outside (D 5791) ; the lowest, 22.5, was in the upper bay 

 (D 5715). It seems hardly necessary to state that owing to the char- 

 acter of the collecting apparatus employed the figures given above 

 represent surface readings in the case of the hydrographic stations 

 and bottom readings in the case of the dredging stations. 



At only three hydrographic stations, one in each of the major 

 portions of the bay, was Spirontocaris cristata taken alone.. Usually 

 it was associated with one species of Crago, frequently with two or 

 three, and rarely with four. Some species of Cancer were found in all 

 but three of the dredge hauls, and "crab megalopa" were obtained in 

 sixteen of the twenty-eight tow-net hauls (H stations). Three speci- 

 mens of Spirontocaris cristata were obtained in company with S. tay- 

 lori from algae stripped from the piles of the Sausalito Ferry building. 



There are three specimens of juvenile Spirontocaris taken from 

 as many hydrographic stations (H 4996, 5122, 5217) which I shall 

 briefly refer to here under Spirontocaris cristata as most probably 

 belonging to this species. The last one was taken in the tow-net just 

 off the north end of Raccoon Strait; the other two in mid-channel off 

 the southeastern shore of Angel Island. The surface temperatures of 

 these stations, taking the time of making the haul into consideration, 

 ranged from 13.8° to 14.6° C, the surface salinity from 20.82 to 32.29. 

 The first of these hauls was made in February, the second in May, and 

 the last in October. In view of the great lapse of time between all 

 three of these records, February to October, it is surprising that the 

 young stages of Spirontocaris were not represented more often in the 

 bay collections. 



The following is a complete list of the stations at which Spironto- 

 caris cristata was taken : D 5702, 5705, 5715, 5723, 5726, 5730, 5732, 

 5739, 5743-5748, 5754, 5755, 5762, 5766-5768, 5772, 5773, 5778, 5779, 

 5791, 579A 5799, 5802, 5803, 5807, 5809, 5828, 5829, 5847, 5848; 

 H 4996, 5005, 5010, 5015, 5091, 5094, 5098, 5099, 5101, 5102, 5112, 

 5115, 5117, 5120, 5123, 5128, 5134, 5138, 5163, 5165, 5186, 5188, 5216, 

 5264, 5298, 5299, 5311, 5317, 5319 ; and Sausalito, March 19, 1912. 



