232 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



this part is generally sausage-like, curved or rounded, and 

 appears quite solid. One of its long ends touches the nucleus 

 while the other reaches the cell-wall on the opposite side. 

 This large central body is connected by a few very thin cyto- 

 plasmic strands with the cell-periphery. It is composed of 

 a number of hyaline globules of various sizes, around which 

 the cytoplasm is crowded. The central cytoplasmic core 

 resembles a mulberry; hence the name. 



Eosino-philes. — These cells are small and round, of the 

 same size as the morocytes, but less numerous. The 

 diameter of the nucleus, which is frequently slightly poly- 

 morphous, is twice the diameter of the morocyte. The 

 cytoplasm is coarse and fills the cell outside of the nucleus. 



Internal Characters. 



Septa. — Some of the septa are slightly thickened. The 

 most anterior thickened septum is that separating somites 

 IV and V; it passes behind the suprapharyngeal glands. 

 This septum is quite as thick as the longitudinal mus- 

 cular layer of the body-wall. There is an exceedingly 

 thin strand separating V and VI. Posterior to this there 

 are no distinct septa until VIII/IX. The following septa 

 are all very thin, but XI/XII, XII/XIII, XIII/XIV are 

 thickened, principally nearest the body-wall on the dorsal 

 side. The last three septa mentioned are as thick as the 

 muscular layer of the body-wall. The septum separating 



XI and XII is connected by muscular straps with the pos- 

 terior parietea on the dorsal side. This structure has been 

 described by Beddard as also belonging to Dichogaster 

 rubens and D. nigra, though occurring in different somites 

 in those species. 



The specimen of Dichogaster Crawi which I sectioned 

 longitudinally is peculiar in that each of somites XI and 



XII has two septa, one at a little distance from the other 

 and running somewhat irregularly. The septum X/XI cor- 

 responds to the intersegmental groove X/XI. In septum 

 XI/XII, the anterior part is situated in the center of XI, the 

 posterior part in the intersegmental groove XI/XII; there is 



