268 bulletin: museum of cOxMparative zoology. 



66. Amphiporus pacificus, sp. nov. 

 PI. 17, figs. 109, 110; PI. 25, figs. 202, 203. 



Body after preservation short, broad and raucli flattened, except 

 head, which is rounded and very much narrower than parts follow- 

 ing (PL 17, figs. 109, 110). Head provided with shallow lateral 

 transverse grooves, which separate it from body. 



Size. — Several specimens from different localities measure, after 

 long preservation, as follows : 12, 25, 35, and 75 mm. in length, and 

 2, 4, 3, and 5 mm. in width, respectively. 



Color. — Some of the preserved specimens still retain a reddish 

 or brownish color on the dorsal surface, but are without color ven- 

 trally. Others have lost all trace of the coloring in life. 



Ocelli. — A small number of large ocelU lie in an irregular cluster 

 on each side of the narrow head. The number is commonly fi'om 

 12 to 20 on each side, of which perhaps 4 to 6 are larger than the 

 others and lie in a single longitudinal row on the antero-lateral mar- 

 gin, wliile the others lie internal and posterior to the marginal row 

 (PI. 17, fig. 110 ; PL 25, figs. 202, 203). 



ProbosrAs. — Proboscis sheath extends quite to posterior end of 

 body. Its walls are thick and are composed of interlaced longitudi- 

 nal^and circular muscular fibers of very large size, instead of being 

 arranged in definite layers as in most species. A somewhat similar 

 condition is found in A. jyu'ictatulus, A. occidentalism and a few 

 other species of this genus, although it was formerly thought to be 

 characteristic of the genus Drepanophorus alone. 



Proboscis is of fairly large size, provided with rather slender cen- 

 tral stylet and two pouches of accessory stylets. Basis of central 

 stylet rather slender, conical or somewhat bell-shaped, and is of 

 about the same length as the slender stylet. Each lateral pouch 

 contains usually 3 to 7 slender stylets. There are 14 conspicuous 

 proboscidial nerves. 



Rhynchodaeum is separated from mouth opening very near tip of 

 snout, and is surrounded with an unusually strong layer of circular 

 muscles. 



Cephalic glands. — Abundant cephalic glands are scattered through 

 the tissues of the head in front of brain. Submuscular glands are 

 wanting, except in a narrow area immediately beneath the lateral 

 margins of body. 



