GENERAL MORPHOLOGY. 
Crust. 7 
2. Muscular System. 
Anastomoses between the primitive fibrillse of the transversely striated 
muscles have been observed in Gammarus , Corophium , and Ligia ) by 
Jousset r>E Bellesme, C. R. xcv. p. 1003. 
3. Digestion. 
The “ pyloric ampullae ” in the stomach of the stalk-eyed Crustacea are 
the subject of a paper by F. MocqUard. They are semi-cylindrical en- 
largements of the wall of the stomach, filled with longitudinal bristle- 
bearing crests with fine channels between, and serve to sift the nutritive 
substances from those which are mechanically unfit for nourishment ; the 
former, after having passed through the channels, come to the spot where 
the ducts of the so-called liver open into the intestinal tract, and chemi- 
cal digestion then begins. These ampulla) are nearly alike in all Decapocla 
and Stomapoda, which have been examined, also in the larva of the lob- 
ster, but they are wanted in the My sides. C. R. xciv. pp. 1208-1211. 
The armature of the stomach of Birgus latro is described by F. Moc- 
quard. The median tooth and the lateral teeth are very strong, and 
there is in the antero-lateral wall on each side a large cartilaginous sub- 
stance, provided with 9-1 1 strong calcareous points, terminating in long 
bristles ; in their natural situation these close the entry of the stomach, 
but when they are separated by the powerful antero-lateral dilating 
muscles, the cavity of the stomach is much enlarged, and the contents of 
the mouth and oesophagus are attracted by suction. Ann. Sci. Nat. (6) 
xiii., Art 3. 
Notes on the intestinal tract and its glands in the fresh-water Copepods, 
by A. Fric, Zool. Anz. 1882, p. 501. 
4. Circulation. 
G. Pouchet makes some observations on the blood of the Crustacea ; 
J. de l’Anat. Phys. xviii. pp. 202-204; abstract in J. R. Micr. Soc. (2) ii. 
pp. 504-506. The blood of the Crustacea is, according to him, highly 
salted ; the blood-cells are very variable in shape, but not amoeboid as 
long as they are within the blood-vessels. 
A. Fric states the presence of amoeboid lymphatic corpuscles in the 
fresh- water Copepods; Zool. Anz. 1882, p. 502. 
5. Secretion and Excretion. 
Huet states the existence of segmental organs in the terrestrial Iso - 
poda. They are unicellular agglomerated glands, opening on each side in 
all segments of the perion and pleon in the upper part of the epimera ; 
some cells are very large (15 mm). They have been described as caudal 
glandular organs by Lereboullet. In Porcellio pictns, they are only found 
in the pleon and in the aquatic Isopoda , as Ligia and Asellus , they are 
totally wanting. C. R. xciv. pp. 810 & 811 ; abstract in J. R. Micr. Soc. 
ii. pp. 337 & 338. 
