EEPOET OH THE HUDIBEAHCHIATA. 
31 
Scyllcea, Linne. 
Scyllcea, Linne, Syst. Hat., ed. x., 1758, vol. i. pp. 644, 656. 
„ Cuvier, Ann. du Mus., t. vi., 1805, p. 416, pi. six. 
„ Bergh, Malacolog. TJntersuch. (in Semper, Eeisen im Arcliip. d. Philipp., Tli. II. Bd. ii. ), 
Heftviii. 1875, pp. 315-343. 
„ Bergh, Beitr. z. Kenntn. d. Moll, des Sargassomeeres, Verhandl. d. k. k. zool.-bot. 
Gesellsch. Wien, Bd. xxi., 1871, pp. 1288-1293. 
„ Bergh, Beitr. z. Kenntn. d. japan. ISTudibr. I., loc. cit., Bd. xxx., 1880, pp. 166-172. 
Corpus oblongum, compressum. Tentacula propria nulla ; rliinophoria compressa, 
auriformia, supra calyculata cum clavo parvo perfoliato. Dorsum angustum ; utrinque 
papillis duabus foliaceis ut plurimum repandis, pagina interna arbusculis brancbialibus 
praeditis ; postice cum crista (caudali) elevata, utroque latere arbusculis branchialibus 
instructa. Podarium angustum, antice rotundatum. 
Mandibulae applanatae, processu masticatorio magno margine minute tuberculato. 
Lingua lata ; rhacbide dente utrinque denticulato ; pleuris multidentatis, dentibus 
utrinque sed inaequaliter denticulatis. Yentriculus lamellis masticatoriis armatus. 
Glandulae hermaphrodisiacae (1-3) discretae. Penis inermis. 
These animals have been known from the time of Seba (1734) and Linne, but these 
two authors described them erroneously, mistaking the upper for the under side. 
Although this error was corrected by Osbeck (1757), and by Forskal ( 1 775), the nature 
and systematic position of the genus was doubtful until the time of Cuvier (1798, 
1805). Recently the genus has become better known through my three Memoirs just 
cited (1871-1880). 
The external appearance of Scyllcea is remarkable, and it is at once distinguishable 
from any other known genus by the character of the rhinophoria and of the large dorsal 
foliaceous papillae, and by the caudal crest covered like the inside of the papillae with 
branchial tufts. — The structure of the mandibles and radula is also q>eculiar ; a masti- 
catory stomach is present. The hermaphrodite gland is divided into three distinct lobes ; 
the penis, as in allied genera, is unarmed. 
Scyllcea inhabits the tropical and subtropical portions of the ocean ; it feeds upon 
Hy droids (especially Campanulariacese), and is found creeping over the surface of Fucoids 
in search of its food ; but it also swims about in the sea. The spawn of the typical form 
has been seen. 
Several species have been described, or at least named, some of which will no doubt 
eventually prove to belong to one circumaequatorial species. 
The following is a list of these species : — 
1. Scyllcea pelagica, Linne. 
Atlantic Ocean. 
