MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



(in millimeters) Continued. 



351 



REMARKS. The earliest figure of Steuopus hispidus with which I am acquainted i.s that of 

 Olivier, published in 1.S11 under the name of Pahvmon hispidus (1, PL 19, Fig. 2). In this drawing 

 the third thoracic leg of the right side is represented as rudimentary. In explanation of this he 

 says: "La piuce gauche mauquoit et paroissoit repousser. Dans uu autre, c'etoit ladroitequi 

 mauquoit et paroissoit repousser de meme." The next drawing appears in Milne Edwards's Atlas 

 (3, PL 25, Fig. 13) of 1837. Like Oliver's plate this is crude and faulty. 



A second and very much better likeness of the Hispidus by Milne Edwards came out in 

 Cuvier's Le Regiie A*nimal (4, PL 50, Fig. 20). This is represented as pale straw color and \v;is 

 evidently made from an old alcoholic specimen. Some of the parts are also figured. Adams's 

 figure (5, Tab. xn, Fig. 6), already noticed, and his brief description agree essentially with the 

 Nassau form. The antenna} are not in their natural position, and should probably be more 

 than twice as long as represented. Of the habits of the species he says : " The Steuopus, Sicy- 

 onia, and Penanis, usually swim in a slow, deliberate manner forwards, and occasionally with 

 a sudden jerk propel themselves backward. They keep at a considerable distance from the shore 

 and seein to love deep still water, never appearing when the surface of the sea is ruffled." 

 The drawing by Dana (6, PL 40, Fig. 8) represents the antenna; of this animal for the first time 

 in a natural position. The anteuual and antenuular stalks are, however, much too slender, com- 

 pared either with Adams's figure or with the Nassau form. The length is given as 3 inches, while 

 the Stenopus on the plate measures about 2J inches. So far as it goes his description agrees in the 

 main with my own. He says : " The legs of the first and second pairs and of the fourth and fifth 

 are colorless, and they are extremely slender, much more so than in the drawings hitherto giving 

 of the Hispidus; third pair is about one-fourth longer than body, fourth joint of second pair nearly 

 twice as long as hand; fourth joint of fourth pair 12-joiuted, and fifth joint 7 -jointed ; tarsus 

 minute (p. 606)." 



This extreme sleuderness does not appear in the specimens examined by me, nor is it apparent 

 in Adams's figure, which is one of the previous drawings referred to by Dana. In making the 

 drawing of the Nassau Stenopus (PL v) great pains were taken to represent all the appendages 



