JOUENAL OF ENTOMOLOGY AND ZOOLOGY 57 



Several specimens taken from a holdfast cast upon the beach at 

 Laguna during July, 1914. 



^ginella hirsuta n. sp. 

 In the adult male the peraeon (Plate II, Fig. 6) is smooth and 

 dev^oid of a horizontal spine ; first two segments short and of equal 

 length although the second is the thicker; third and fourth equal in 

 length and nearly twice as long as the second; fifth longer than the 

 fourth but not as thick; sixth and seventh a fourth as long as the 

 fifth, decreasing in size respectively. The superior antennae are 

 only half as long as the body; first joint a little longer than the 

 cephalon; second joint longer than the first but not as thick; third 

 joint only half as long as the second and half as thick; flagellum 

 two-thirds as long as the peduncle and made of 16 segments. In- 

 ferior antennae about as long as the peduncle of the superior and 

 armed with many long hairs on the dorsal surface; flagellum two- 

 jointed. Mandible (Fig. 10) made up of a strong cutting plate 

 with five unequal teeth and a large rounded secondary plate with a 

 few short prominences; several feathery hairs lie between the two 

 plates and the mandible is supplied with a three-jointed palp. The 

 first gnathopod (Fig. 12) is small and attached far forward; palm 

 broad, nearly as wide at the base as the tip and armed with two 

 spine-like teeth at the base and a few scattered hairs; edge finely 

 toothed; claw medium and toothed with many small and a few regu- 

 lar teeth. Second gnathopod (Fig. 7) attached far forward on 

 the second body segment; first joint longer than the others com- 

 bined; palm long and narrow and armed with a small toothed lobe 

 at the base and another larger tooth a little posterior; margin 

 thickly covered with many long hairs; finger long, curved and also 

 lined with many hairs along the inner margin. Fig. 8 shows the 

 second gnathopod of a younger specimen, 10 mm. long; the palm 

 is thicker, the inner margin not as regular in outline and armed with 

 fewer hairs, while the finger is shorter than in the adult. Fig. 9 

 is the second gnathopod of a still younger specimen, 7 mm. long; 

 the palm is much shorter and thicker and the inner margin lacks the 

 second spine at the base and has a few blunt prominences at the 

 posterior extremity and but few hairs; the finger is similar in shape 

 to that of the adult. The third, fourth and fifth peraepods (Fig. 



