106 jTirst annual Report 



Crangon nigromaculatus Sm. 



Under stones in sandy bottomed tide-pools. The color is trans- 

 lucent white, peppered with black dots, a larger dot on either side 

 of the fifth and sixth pleon segments. When this species is exposed 

 by the turning over of a stone, it settles immediately into the surface 

 of the sand, and is then almost indistinguishable. 



Hippolysmata californica St. 



This extraordinarily brilliant Hippolytid with its red stripes is 

 certainly one of the finest things to be found in the tide-pools. We 

 frequently pointed to it as one of the most beautiful marine animals 

 to lie found at Laguna. 



Alphaeus clamator Luck. 

 Common in sponge masses and kelp holdfasts. 



Betaeus longidactylus Lock. 

 A very beautiful olive green species, abundant in tide-pools. 



Heptacarpus pictus (Stimp.) 



(Figures 55 and 5(5) 



This small and very beautiful Hippolytid is abundant in the tide- 

 pools and also outside in the kelp beds. Its greenish semi-trans- 

 parency, with oblique reddish marks on the pereion, make it wholly 

 inconspicuous almost invisible in alga-filled tide-pools. The tow- 

 net, however, quickly reveals it as a very abundant species. 



Order TANAIDACEA 



A number of species of these minute tube-dwellers were encoun- 

 tered among the alga? lining tide-pools, and also in kelp holdfasts. 

 They will be worked up later. 



Order CUMACEA 



Pseudocuma lagunae n. sp. 



(Figure 57) 



We were greatly interested to encounter in one of the lower tide- 

 pools a minute Pscitdocuin<i. It appears to represent an undescribed 

 form. 



I'Yniale. Length 1.5 mm. Carapace a little less than one-fifth the total length 

 and nearly as deep as long. Pseudorostrum short, truncate, and not at all elevated. 

 l',,u k of the large eyes is a deep vertical plica standing nearly at right angles to the 

 dursuni and reaching lower border of carapace, giving a remarkable appearance of a 

 separated head. Sides of carapace with three curved ridges. Entire cephalo- 

 thnracic region about as long as remainder of body. Telson equalling basal joint 

 of uropods, and narrowing at the tip to a subacute point. Appendages as illustrated 

 in the figure. 



Order MYSIDACEA 

 Mysis costata Holmes 



This species occurs in inconceivable myriads in the kelp beds just 

 off shore, where Mr. Guernsey took it with the tow net. 



