1914] Esterly: Schizopoda of the San Diego Region 15 



Genus Psendomma Sars 



Pseudomma Sars (1885), p. 188. 

 Pseudomma, Zimmer (1909), p. 99. 



This genus is characterized by degenerate eyes. Each eye has 

 been reduced to a plate and the two are fused together in the middle 

 line; they show no facets or pigment (pi. 1, fig. 7). 



Our material consists of one female taken in haul 2048. All the 

 thoracic legs are broken off, but the animal resembles P. parvum Van- 

 hoffen rather closely (see Zimmer, 1909, p. 104). The antennal scale 

 reaches beyond the peduncle of the antennule and the tooth on the 

 scale reaches only to the end of the scale (pi. 1, fig. 7) ; in parvum 

 the tooth extends a little beyond the scale. The proportions of the 

 joints of the antennular peduncle are the same as in parvum. Most 

 of the terminal bristles of the telson are broken ; the side margin has 

 six small spines on the right and five on the left, and they extend 

 along half the length of the telson instead of along the last third, as in 

 parvum (pi. 2, fig. 21). This is the most noticeable difference between 

 our specimen and parvum. 



P. helgicac Holt and Tattersall resembles the San Diego specimen 

 particularly in the armature of the telson and in the shape of the 

 antennal scale, but since the margin of the eye plates is smooth in 

 helgicae and serrate in our form, the two are not identical. I have 

 been unable to find an account of the condition of the edge of the ocular 

 plates in parvum, but Tattersall (1908, p. 29) states that helgicae is 

 the only species except P.australe Sars in which the edge is smooth. 



On the whole, it is desirable to possess more material before as- 

 signing a definite status to the San Diego specimen. 



The length is 10 mm. and there is a small amount of rosy pigment 

 in the antennae and antennules, a distinct spot in the mouth, and in 

 the telson and uropods. 



Subfamily Mysinae 



Genus Mysis Latr. 



Mysis costata Holmes 



Mysis costata Holmes (1900), p. 221, pi. 4, figs. 70-72. 

 Mysis costata, Hansen (1913), p. 177, pi. 9, figs. 2a-d. 



One specimen was taken in haul 3147, a female with larvae in 

 the marsupium. The structure is in all respects as described by 



