20 CRUSTACEA. 



two sections and two flattened lobes (E, h 2, // 3). 

 The outer lobe is smaller than the inner, and both lobes 

 are fringed with short hairs. Those of the first and 

 sixth rings, in both male and female, however, appear 

 to differ greatly from the others. Closer observation 

 of the first pair (Fig. 8, C,f 1), however, will show the 

 basal section (// 1) and the inner terminal lobe {h 3), 

 while the outer lobe is undeveloped. In the sixth 

 pair, on the other hand, there is an excessive develop- 

 ment of the three parts. The basal section (A 1) is 

 broader, thicker, and stouter, and the two delicate 

 divisions have become strong, fan-shaped paddles (// 2, 

 li 3). The outer lobe is jointed transversely, while both 

 lobes, like those of the other swimmerets, are fringed 

 with hairs. 



Having observed the six pairs of appendages, with 

 tneir six corresponding abdominal rings, the terminal 

 piece, or telson (Fig. 8, C, ab 7), so called because it 

 means end, still remains to be more carefully observed. 

 It is flat and triangular in shape, fringed along its edges, 

 and with the anal opening on its under side. No ap- 

 pendages are found attached to it, and if- the lobster 

 were the only crustacean studied, it would be impos- 

 sible to tell whether the telson was a segment, or a 

 flattened outgrowth in the form of a spine. There 

 is, however, another crustacean, the little crab-lobster, 

 Porcellana, living in the warmer waters of the Pacific 

 and Indian oceans, and also as far north on our coast 

 as Newport, R.I., which can be used to clear up this 

 doubtful question. 



This curious little crab possesses a telson, with an 

 unmistakable pair of appendages attached to it, proving 



