336 MARINE INVERTEBEATE FAUNA OF PLYMOUTH. 



Philine punctata, of which only a single specimen was recorded 

 in my list of 1890, I find to be plentiful in twenty fathoms among 

 shells and stones covered with Bugula. 



Gylichna t7'uncata has been met with several times, but its real 

 locality is yet to be discovered. 



Young specimens of Oscanius memhranaceus were dredged re- 

 peatedly in the Sound during September, and on the night of the 

 21st were found actively swimming in some numbers at the surface 

 of the sea. 



Six additional specimens of Loina^iotus were dredged within the 

 Sound during June and September, but as yet no large individuals 

 have been met with. 



Cratena amcena and olivaceah.a,ve been obtained rather often, and the 

 same remark applies to Jorunna Johnstoni and Lamellidoris aspera. 

 Calma glaucoides was dredged on June 18th, and a beautiful specimen 

 of Idalina elegans, grotesquely embedded within a small Cynthia 

 upon which it had been feeding, on July 80th. Mr. Gamble twice 

 brought me specimens of a little >(:Eolid, which proved upon examina- 

 tion to be the Embletonia pulchra of Alder and Hancock, although 

 much paler in coloration than the type of that species. Amphorina 

 coerulea, a species which has not been met with on the English coasts 

 since the time of Montagu, was dredged on September 12th. The 

 individual captured was 3 mm. in length, and the whole of the body 

 with the head and tentacles was of a semi-transparent pale greenish 

 colour. The gorgeous cerata are the chief peculiarities of this little 

 creature. The colour of these is partly due to the caeca shining 

 through, and to the superficial markings of the skin. The casca in this 

 case were deep sage-green, granulated, nearly filling the cerata. 

 The upper half of each ceras was marked by conspicuous bands of 

 colour — a rather broad band of glistening dots of cerulean blue, 

 bounded above and below by a ring of bright yellow pigment-cells, 

 branched and reticulating. There was no trace of orange. The 

 rhinophores were rather short and conical, not filiform, as Vayssiere 

 found to be the case at Marseilles (' Ann. Mus. Hist. Nat. Marseille,' 

 t. iii, mem. 4, pi. i, fig. 5), nor nearly so long as represented in his 

 figure, perhaps because they were incompletely extended. They 

 were held vertically upwards, parallel with each other ; while the 

 oral tentacles, slightly dilated towards their extremities, were held 

 horizontally, and curved outwards on each side. There were seven 

 rows of stout clavate cerata (2 x 2, 3, 4, 3, 2, 2, 1). The first three 

 rows were close together, forming a cluster as in Cratena ; this was 

 separated from the fourth row, and the posterior rows from one 

 another, by a considerable interval. 



In August two specimens of Antiopa hyalina were dredged, one 



