570 GASTROPODA. [Opisthobranchia, 







1. Gargamella novozealandica, Eliot, 1907. 



Gargamella novozealandica, Eliot, P. Mai. S., vii, Sept. 1907, 329, 341. 



Dorsal surface bluish-grey and covered with minute elongate soft 

 tubercles, the texture being villous rather than warty or granulate. 

 Under the microscope a minute brown reticulation can be seen between 

 the tubercles. The rhinophore-openinys lie in little hillocks, but are 

 not protected by sheaths. The branchife are 10 in number, compressed, 

 and pyramidal in shape ; they seem to be pinnate, and in places bi- 

 pinnate. The margin of the branchial pocket is not raised. The 

 integuments, and especially the tubercles, are full of spicula, straight 

 or slightly undulated, with a granulated surface ; they project from 

 the tips of the tubercles. The oral tentacles are small, linear, but dis- 

 tinct. The anterior margin of the foot is deeply grooved and expanded 

 into ample flaps, as in Kentrodoris. (Eliot.) 



Length, about 16 mm. ; breadth. 7 mm. 



Dark pigment was found on the labial cuticle, but no armature. 



The radula is small, the maximum formula being 18 x 20 +0 +20, 

 and most of the rows are smaller. The teeth are simply hamate, with 

 long bases. The innermost are low. and have on the inner side a 

 slight projection, hardly amounting to a denticle. The teeth increase 

 in size up to the middle of the row. and the two or three outermost 

 are small and thin. 



The (jenitalia are small and hardened, but it was ascertained that 

 what seems to be the vas deferens was armed with transparent discs 

 with central spots and spines exactly like those of G. imwaculata 

 figured by Bergh. (Eliot.) 



H-ab. Auckland Harbour. 



Remark. The specimen is probably immature, but seems referable 

 to Gargamella, which is distinguished from Thordisa only by possessing 

 an armature on the genitalia, and is perhaps merely a subgenus. (Eliot.) 



Genus 5. ATAGEMA, Gray, 1850. 



Atagema, Gray, Fig. Moll. Anim., iv, 1850, 104, pi. 64, f. 11. Type : Doris 

 carinata, Q. & G. Atagema, Benham, T.N.Z.I., xxxvii, 318. 



Body oval, convex ; back with a median keel, granulated, and a 

 widish mantle-flap. Branchia? tri- or quadri-pimiate. Tentacles small ; 

 foot rather stout. There is no labial armature. The radula has a 

 narrow naked rhachis and numerous hamate teeth. Genitalia un- 

 armed. 



Apparently the only peculiarity about the animal is the dorsal 

 keel, and it must for the present remain doubtful whether Gray was 

 justified in founding a new genus on this character alone. (Bergh.) 



The genus is precinctive to New Zealand, and the type is the only 

 species known. 



