550 SUMMARY OF CURRENT RESEARCHES RELATING TO 



being oblique. The connective layer (cl) has a lacunar structure. 

 The lacunae are lined by a cylindrical endothelium. The epithelium 

 lining the depressions of the stomach, &c., may be said to be glandu- 

 lar ; that occurring over certain conical processes of the connective 

 layer is absorptive. From the distribution of the glandular and 

 absorptive organs, Dr. Bonardi is led to abandon the terms oesophagus, 

 stomach, and duodenum as expressing physiological facts. With 

 the exception of the buccal portion, which is used for prehension, 

 and the extreme posterior section, acting as an expelling organ, no 

 separate functions are assignable to any part of the canal. The 

 v^all of the duct of the salivary glands consists of an outer cellular 

 connective layer continued from the different glandules, of a median 

 muscular coat comprising circular and oblique fibres, and of an 

 epithelium made up of small cylindrical cells, on vphich no cilia were 

 found. The refractive granules in the cells of the inner surface of 

 the hepatic lobules are considered, with Barfurth, to be calcareous, 

 but the "ferment-cells" described by that author were not made 

 out. Numerous muscular fibres were found in the peritoneum of 

 the liver. 



Aplysise of the Gulf of Naples.* — F. Blochmann distinguishes 

 three species of Aplysia in the Gulf of Naples by the following 

 characters : — 



I. Lateral lobes free as far as the foot. A fine canal leads into 

 the cavity which contains the shell. Behind the genital 

 opening is a racemose gland. 



Animal 20-80 cm. long ; black, with white and grey spots. 



Aplysia limacina L. 



II. Lateral lobes fused together as far as the siphon. A wide hole 



without folded margins leads into the cavity which contains 



the shell. Behind the genital opening a group of unicellular 



glands, each of which has a separate external pore. 



a. Animal 10-20 cm. long; clear reddish to blackish 



brovm, white spots, the margins of which coalesce. 

 The upper side of mantle has no cilia. Aplysia 

 depilans L. 



b. Animal 7-15 cm. long ; same colour as the last, the 



spots, however, smaller, and distinct, with usually a 

 black border. Upper side of the mantle ciliated. 

 Aplysia punctata Cuv. 



The paper contains further details of the anatomy of these three 

 species, a complete list of synonyms, and a bibliography of the subject. 



Morphology of the Acephalous MoUusca.f — H. de Lacaze- 

 Duthiers devotes his first memoir on the ' Morphologic des Acephales/ 

 to the remarkable Aspergillum (A. dichotomum) or Watering-pot Mol- 

 lusc, the animal of which is so rare, though the well-known shell is 



* MT. Zool. Stat. Neapel, v. (1884) pp. 28-49 (1 pi.). 



t Aroli. Zool. Exptr. et Gen., i. (1883) pp. 665-732 (5 pla.). 



