488 University of California Puhlications in Zoology [Vol.16 



usually flattened throughout its entire length ; heads not sharply set 

 off, but tapering gradually into peduncle which becomes gradually 

 smaller until attached end is reached. New lobes spring at times from 

 substratum and result in a dense growth of more or less parallel, 

 slender lobes (pi. 38, fig. 4). Sometimes many lobes arise from a com- 

 mon center, resulting in a more or less spherical body whose surface 

 is made by the heads of the lobes. In this form of growth the heads 

 of the lobes have a broader anterior expanse than in the form first 

 described ; the lobes themselves sometimes branched. Test gelatinous 

 and transparent, but having a dirty tinge due to innumerable small 

 test cells. No common cloacal orifices present. Length of longest 

 lobes about 2 cm., width of heads about 7 mm., thickness 3 mm. 



Zooids ( pi. 45, fig. 61 ) . — Not arranged in systems ; both siphons 

 opening on surface of distal ends of lobes of colony ; long and slender, 

 the postabdomen extending through almost entire length of peduncle 

 to end in a slight swelling which contains heart ; abdomen somewhat 

 longer than thorax. Mantle contains longitudinal muscle bands which 

 run length of zooid and are separated by considerable spaces over 

 thorax and abdomen, but are closer together in postabdomen. 



Branchial system. — Both orifices di.stinetly 6-lobed. Branchial 

 tentacles about twenty, alternating long and short. Branchial sac 

 with eight series of stigmata, about fifteen stigmata in a half-series. 

 Dorsal languets about as long as stigmata ( pi. 45, fig. 61 ) . 



Digestive system. — Intestinal loop somewhat longer than branchial 

 sac. its plane oblique to sagittal plane of zooid ; esophagus about equal 

 in length to stomach, tapering to a .small diameter at its entrance into 

 stomach ; stomach somewhat longer than broad, wall longitudinally 

 folded, the folds, never more than six or seven, sometimes broken, 

 often one whole side practically foldless; portion of intestine between 

 stomach and loop about twice as long as stomach, constricted about 

 midway in its course ; a small, short tube intercalated into intestine 

 at beginning of rectal limb ; lobed anus located a little anterior to 

 middle of branchial sac («.. pi. 45, fig. 61). 



Reproductive system. — Ovary posterior to intestinal loop, not in 

 contact with it ; testis lobes numerous, beginning just posterior to 

 ovary and extending through entire postabdomen (o.. t., pi. 45. fig. 61). 



Habitat and distribution. — So far the species has been taken only 

 at Rincon Point, Santa Barbara. California. It belongs to the littoral 

 zone alone, so far as we know. 



In spite of the violence done to the genus Amarmicium by forcing 

 this species into it, after much deliberation we have decided that for 

 the present, at least, to do so is justifiable. As will be seen from the 

 description and figures, the animal is a perfectly typical member of 

 the genus in every respect excepet possibly the character of the colony 

 and certainly the form of the atrial orifices of the zooids. The pedun- 

 culation and lobulation, and the sand-incrustation of the colony, 

 though not altogether typical are by no means unique, the type species 



