1.880.] NATURAL SCIENCES Of PHILADELPHIA. 125 



Aphelodoris Antillensis, Bergh. 

 (Cf. Malakozoolog. Blatter, N, S., i, 1879, p. 107-113). 



12. a, ganglia huccalia^ with 6, ganglia gastr-o-ossophagalia ; c. 



secondary ganglion, 



* 200 



1 3. Median part of two series of plates ; aa, innermost ; 66, second 



plates,* ^^. 



14. A large lateral plate,* ^f-. 



15. Outermost double plates of two series,* ^|^. 



16. Outer part of two series with two plates ; aa, outermost,* ^^•- 

 11 7. The sixth plate from the outer margin of the radula,* ^f ^. 



! 8. Outer part of three series with 3 plates ; a, outermost,* ^^. 



Polycera Holbolli (Moll.). 



1 9 The genital papillae, from the front. 



20 The same, from the side. 



21. First lateral plate, from above,* ^y^. 



January. 1880. 



ERRATA FOR PART I. 



On account of the inability of the author to read the proofs, 

 and from certain obscurities in the manuscript, some errors crept 

 into the first part of this paper, and the arrangement of the para- 

 graphs was somewhat confused by the printer. 



The delicacy and beauty of the plates in their original state, 

 liaving been destroyed by the printer, the present ones have been 

 steel-surfaced, to avoid, if possible, a similar misfortune. 



The specific name Calif orniensis ( Ghromodoris) was substituted 

 in the printed text for Calensis^ which appeared on the plate and 

 ill the manuscript under the idea that the latter was intended 

 merely as an abbreviation. 



The following list of errata has been received from the author ; 

 it is believed that the present concluding part of the paper is 

 much less in need of such corrections. 



Page 128 ( 72), line 15 : for Triopa modesta, B., read Triopha viodesta, B. 

 " 129 ( 73), line 22 : for mandibulse read . Mandibulte. 

 '' 130 ( 74), line 2 : for genus read penis. 



•' 132 ( 76), line 30 : a comma to be put before the parenthesis, and 



the comma after the parenthesis to be cancelled. 



