106 Fitst 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 be found at Laguna. 
Alphaeus clamator Lock. 
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 56) 
This small and very beautiful Hippolytid is abundant in the tide- 
pools and also outside in the kelp beds. Its greenish semi-trans- 
pareney, 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 alge lining tide-pools, and also in kelp holdfasts. 
They will be worked up later. 
Order CUMACEA 
Pseudocuma lagunae n. sp. 
(igure 57) 
We were greatly interested to encounter in one of the lower tide- 
pools a minute Pseudocuma. It appears to represent an undescribed 
form. 
Female. 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. 
Back of the large eyes is a deep vertical plica standing nearly at right angles to the 
dorsum and reaching lower border of carapace, giving a remarkable appearance of a 
separated head. Sides of carapace with three curved ridges. Entire cephalo- 
thoracic 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. 
