1819.] NATURAL SCIENCES OF PHILADELPHIA. 115 



formed of densely set (bifid) hooks The rhachis of the tongue 

 with a depressed plate with a low denticulated hook; the pleurae 

 with a series of hook-shaped teeth, the inner denticulated on both 

 edges; the outer only on the exterior margin. The glans penis 

 armed with rows of small hooks. A spoon-shaped process at the 

 upper wall of the vestibulum. 



Alder and Hancock have given some notes on the nervous and 

 genital systems and on the structure of the radula of the typical 

 species, which has also been the subject of some observations by 

 Meyer and Mbbius. 



Up to the present time only three species of the genus are 

 known, two belonging to the northern part of the Atlantic, the 

 third to that of the Pacific ; nothing is known of their spawn or 

 their biology. 



1. Cadlina repanda (A. & H.). Oc. Atlant. sept. 



2. Cadlina glabra (Friele & Hansen). 



Doris glabra, Pr. & Hans., 1. c. p. 2. Oc. Atlant. sept. 



3. Cadlina Pacijica, Bergb, n. sp. Oc. Pacific, sept. 



1. Cadlina repanda (A. & H.). PI. V. fig. 15 ; PI VI. figs. 21, 22; PI. VII. figs. 

 9-18 ; PL VIII. figs. 3-6. 



Doris repanda, A. & H. Monogr., Part III., 1846, Fani. I. pi. 6 ; Part 



V., 1831, Fara. I. pi. 1, figs. 10, 11; pi. 2, fig. 14, Part VI., 1855, 



app. p. II. pi. 46, suppl. fig. 7. 



Hancock and Embleton, Anat. of Doris, Phil. Trans., 1852, II. p. 212, 



215, 219, 233,' PL XI. fig. 3 ; PI. XII. figs. 11-13 ; PL XIV. fig. 5 ; 



PL XV. fig. 5 ; PL XVI. fig. 10 ; PL XVII. fig. 9. 



Meyer and Moebius, Fauna der Kieler Bucht, II. 1872, p. 68, Taf. fig. 



1-7. 

 Doris Icevis, Fleming. Brit. Anhn., p. 282, 1828. 

 Doris obvelata, Loven, Ind. Moll. Scand., p. 4, 1846. Sars, Reise til 



Lofoten og Finmarken, p. 76, 1851. 



Color lacteus vel luteus, limbo palliali supra maculis luteis vel 

 lacteis distinctus. 



Branchiae e foliolis quinque composita. 



Hab. M. Atlant. sept. 



It is useless to discuss the question, if the D. Isems Linne 

 represents this species; if this in reality was the case, the name 

 of Linnaeus ought to be re-established, as it has been done by 

 Morch 1 (Acanthochila laevis, M.). It is scarcely worth while 



' Cf. Morch, Faunula Moll. Islandise, Naturh. Foren. vidensk. Meddel. 

 1868, p. 202. 



