4 1 4 Mi see llaneous. 



I thought of nn equivalent to the lateral organs of Rhipidoglossa, 

 hut then noticed that the organ was present only in the foremost 

 portion of the lateral mantle-chamher, and 1 therefore assumed that 

 a connexion existed with the rudimentary gills or organs of Spengel. 

 The mode of preservation of the animal under investigation Mas not 

 such as to enable a clear idea of the innervation to be obtained, a»id 

 therefore in a figure of Patindla (hmrrata recently i)ublislied with 

 another object (" Eeitriigc zur Kcnntnis der MoUusken. — 1. Ueber 

 das Epipodium," Zeitschr. f. wiss. Zool. 5:3 Rd., Taf. xxiii. fig. 3), 

 which shows a thickened streak at the spot indicated, 1 had desig- 

 nated this simply as " sense-organ '' (" Sinnesorgan "), 



A short time ago T received some well-preserved sj)ecimeu3 of 

 Patina pellucida from Heligoland, and in a series of sections 1 have 

 found the sense-organ again very distinctly, and have determined its 

 innervation. The nerve, wbicli runs beneath the streak of sensory 

 epithelium, proceeds from the olfactory ganglion of Spengel ; it is 

 on the whole feebly developed and not altogether easy to distinguish 

 between the fibres of the retractor muscle, though most distinct in 

 front. The epithelial band is fairly broad at the spot where it 

 encircles the retractors in front ; from this point it becomes still 

 broader towards the middle, and the cells become flatter, while at 

 the outer side it soon narrows considerably, while the columnar 

 cells diverge fan-wise ; at this spot it differs roost from the sur- 

 rounding epithelium, though the entire streak exhibits the charac- 

 teristics of sensory epithelium in a well-marked degree. 



With I'eference to the dissemination of this organ, it may be 

 remarked that it is possible that it occurs in all Patellidie, excluding 

 Acmo'a and Lepeta, since I have traced it in PatiUa carulea in 

 sections and have seen it macroscopically in Paimella, two forms 

 which are not far distant from the terminal points of the phyletic 

 developmental series. 



Neither Spengel (" Die Geruchsorgane und das Nervensystom von 

 Mollusken," Zeitschr. f. wiss. Zool. 35 Bd.) nor Bernard (" Organes 

 palleaux des Prosobranches," Ann. Sc. Nat. vii. 9), who has recently 

 minutely investigated the branchial sense-organs of the Proso- 

 branchia, have noticed this prolongation of them at the sides of the 

 body in Patellidae, but have only observed the portion which is in 

 immediate connexion with the nuchal papillae, the rudiments of the 

 Zygobranch gills. Bernard even expressly states with regard to 

 Patina jyiVucida that " the organ of Spengel is situated entirely 

 behind the ganglion." The course of the organ as described above 

 appears to me to be not without importance, and I therefore wished 

 to give a provisional account of the fact ; I shall revert to it later on 

 in greater detail. — ZooJof/ischer Anzeiger, xvi. Jabrg., no. 412 

 (February 13, 1893), pp. 49, 50. 



On Cirripedes and other Crustaceans commensal tcith Mediterranean 

 Turtles. By MM. E. CnEVREtrx and J. de Guerne. 



It is seldom that the opportunity is presented to zoologists of 

 observing the pelagic Vertebrates at sea under the normal con- 

 ditions of their existence. Accordingly on board the ' Hirondello,' 



