752 TACK SKOOSUKKC. 



is about as long as the second exopotiite joint. Scroncl joint: Tlic two ventral bristles have 

 short, tine hairs and are in most oases soniewliat loiiijer relatively tliiiii those of the male. Third 

 joint: The bristles are like those of the male, with short, hue hairs. End joint: The dorsal 

 one of the three bristles is in most cases about as long as the total length of the three distal 

 joints; the middle bristle is somewiiat shorter, the ventral one is the shortest, being about 

 a third shorter than the dorsal one; these three bristles are of the same types as the corresponding 

 bristles on the fifth limb. Pilosity: Hairs are developed at the same places as in the male sixth 

 limb, but are in most cases somewhat more abundant. 



The r o d - s h a p e d o r g a n (fig. 13) is of the same type as in the male and reaches 

 to about the point of the first antenna. 



Eggs: — A particularly interesting point about this species is that the female carries 

 her eggs for a time between the back of the body and the shell; as has already been pointed out 

 (p. 561 above), this is the only case of care of the brood that has been found so far. (Curiously 

 enough, it is not mentioned by preceding authors, although they investigated females; this 

 fact has helped to prevent £. Chierchiae, G. W. Mt^LLKH, 1906 a and 1908, from being included 

 in the list of s\Tionyms given above; there were no females in the material of this species 

 investigated by G. W. MCller, 1890 a.) Some of the females investigated by me had no eggs 

 in their brood-chambers; in others two to seven or even eight eggs were found; the eggs 

 in the brood-chamber were comparatively large; cf. the adjoining figures 6 and 7. 



Synonyms. Remarks: — The form described b}' me above is either very closely related to the E. 



Chierchiae from the coast of Brazil described by 6. W. MUller, 1890 a, or else it is identical 

 with this form. In spite of a number of differences between the original description of this 

 species of G. W. MtJLLER's and the specimens on which the description worked out by me above 

 is founded I decided in favour of the latter alternative. This was due, first, to the fact that 

 a number of the specimens investigated by me were caught not far from the type-locality of 

 the species just mentioned, and, secondly, to the superficial nature of G. W. MOller's original 

 description, which makes it not improbable that these differences are due to mistakes on the 

 part of this writer. 



The following are the main difierences between the original description of E. Chierchiae 

 worked out by G. W. Mt'LLER and the specimens investigated by me: 



Shell: The right valve always had a moderately long spine postero-dorsally in the 

 specimens investigated by me. In G. \V. Muller's original description it is stated that 

 a spine of this sort was only found sometimes (five mature males were investigated by this 

 author): ,,Bisweilen ist der rechte A'orsprung in eine Spitze ausgezogen"; pi. XXVIII, fig. 8 

 in this work of G. W. Mt'LLER's represents a shell with such a spine; in the explanation of the 

 figure this type is described as an ,,abweichende Form". According to this writer's exposition 

 the left valve is never provided with a spine dorso-posteriorly in this species; in addition this 

 species has no selvage: ,,Saum scheint iiberhaupt zu fehlen." 



First antenna: \Miile the specimens described by me above had somewhat more 

 than twenty sensory bristles on the fourth joint, arranged in three almost parallel rows. 



