AGLAJA. 45 



Japan : A. gigliolii. 



Sandwich Is. : A. nuttalli, " Philinopsis" speciosa and nigra. 

 W. coast of the Americas : A. maculata, purpurea, diomedea, ocel- 

 ligera, adellce. 



West Indies: A. punctilucens and gemmata. 

 The genus is not known fossil. 



A. TRICOLORATA Renier. PI. 1, figs. 10, 11 ; pi. 14, f. 81. pi. 13, 

 figs. 71, 72, 73, 74, 75. 



Back of the body and outer surface of pleuropodial lobes chest- 

 nut-brown or coffee colored, with round snow-white pearl-like dots ; 

 border of dorsal shield aud pleuropodia marked with a narrow blue 

 band, inside of which is an orange band. Posterior body lighter 

 than the anterior ; sole velvety-black with a bluish luster, with some 

 small white dots in front and behind. Mantle with two deeply sep- 

 arated lobes behind, the left one always provided with aflagellum or 

 filament (pi. 1, figs. 10, 11). Length 4-5 cm., breadth with spread 

 parapodia 2'5-2'8 cm. ; alt. to apex of frontal shield 1 '6-1*9 to 1/3- 

 1*5 cm. 



Specimens in alcohol retain the coloration remarkably well, but 

 contract much, length 3 cm. 



Shell (pi. 14, fig. 81) proportionately smaller than in A. depictum, 

 less concave ; milk-white in the middle, more or less translucent 

 toward the edges ; nucleus consisting of one whorl, the second whorl 

 forming all of the dilated portion of the shell. 



Mediterranean Sea. 



Aglaja tricolorata RENIER, Tav. di Classificazione pi. 8, (1807) ; 

 Oss. postume di Zool. Adriat., 1847, p. 5, 7, pi. 16, f. 12, 13. Dori- 

 dium tricoloratum BERGH, Mittheil. Zool. Sta. zu Neapel, xi, p. Ill, 

 pi. 8, f. 1-10 ; Bull. Mus. Comp. Zool., xxv, p. 208, pi. 12, f. 4. 

 Doridium meckelii DELLE CHIAJE, Mem. i, 1823, p. 117-123, 133, 

 135-136, pi. 10, f, 1-7. CUVIER, Regue Anim. 2d edit., iii, p. 64. 

 CANTRAINE, Malac. Medit., p. 74. Acera meckelii PHIL., Enum. 

 Moll. Sicil. ii, p. 93. Doridium membranaceum Meckel VAYSSIERE, 

 Ann. des Sciences Naturelles Zool. (6), ix, p. 73 et seq., pi. 7, f. 56, 

 57, 59-67 ; pi. 8, f. 68, 69 ; Rech. Moll. Opistobr., p. 48-49, pi. 2, 

 f. 45-47. 



Besides the differences in the shell and coloration, this species dif- 

 fers from A. depicta in having two deeply separated lobes on the 



