2 Mr. H. D. S. Goodsir on the Specific and Generic 



tubercle is situated about the middle of the first thoracic segment 

 and is squared or truncated, bearing four small dots or eyes of a 

 jet-black colour, which are situated in the form of a square round 

 its superior edge. 



Phoxichilus. 



Phoxichilus has the ocular tubercle situated a little before the 

 middle of the first thoracic segment ; it is of considerable size, 

 erect, and pointed at its extremity. The eyes are four in number, 

 and are placed rather above the middle of the tubercle. The 

 rostrum is clavate with a slight bulge before the middle ; a fine 

 line runs along its centre on each side from its base to the tip, 

 which is crossed at right angles by another near the extremity 

 (PL I. fig. 8). 



The last joint of the tarsus is bent and serrate on its inferior 

 edge (fig. 5). 



The ovigerous legs of Phoxichilus are seven-jointed ; the first, 

 third, fourth and sixth are almost all of equal length ; the second 

 and fifth are equal (fig. 4). 



Phoxichilidium coccineum. 



The ocular tubercle of Phoxichilidium is situated on a projec- 

 tion which extends forwards from the first thoracic segment above 

 the rostrum, and which likewise supports the mandibles. The 

 ocular tubercle is conoid, truncated, with four eyes surrounding 

 it at regular intervals, and which are situated at a little distance 

 from the top. The rostrum is large and clavate, and with the 

 crucial lines as in Phoxichilus (PI. I. fig. 6). 



The last joint of the tarsus is semilunar, with four spines 

 arising from its basal and inferior edge (fig. 8) . The oviferous legs 

 are five-jointed, the first two and last being almost all of equal 

 length, and the third as long as any of the other two conjoined 

 (PL I. fig. 7). 



In Pallene circularise the ocular tubercle is situated at the pos- 

 terior edge of the first thoracic segment, and is very slightly raised 

 above the surface of the segment. The eyes are situated round 

 its superior edges (PI. I. fig. 9). 



The last tarsal joint is slightly curved, but the edges are par- 

 allel; the claw is blunted (fig. 10). 



Pasithoe vesiculosa^ ; 



By Pasithoe we are gradually led from the nonpalpate to the 

 palpate genera of the order, and at the same time we find these 

 organs in a maximum state of development. In Pasithoe the ocular 



* Jameson's Edinb. Phil. Journ. vol. xxxii. p. 137. pi. 3. fig. 2. 

 t lb. vol. xxxiii. p. 370. pi. 6. fig. 17. 



