COMPLEMENTAL MALE. 235 



pairs of spines on the abdomen, and eleven pairs on the 

 thoracic limbs. 



A little way beneath the lower or anterior pair of limbs, 

 the thorax is abruptly bent, and becomes confluent with 

 the lower internal parts of the whole animal. Here, the 

 very delicate membrane of chitine which lines the sack or 

 tube, extending from the external orifice, can be seen to 

 be continuous, as in all Cirripedes, with the outer tunic 

 of the thorax. Within the thorax, there are some longi- 

 tudinal muscles, without transverse striae, which, I believe, 

 enter the short limbs, but not the abdomen, as I infer from 

 the latter not being everted when they are pulled. At 

 their lower ends these muscles terminate abruptly, and 

 from being contracted are often a little enlarged. They 

 extend a short way beneath the lower pair of limbs, and 

 are, I suspect, attached to the outer integument of the 

 animal, near the base. 



After the most careful dissection of very many speci- 

 mens, and their examination in many different methods 

 (as by caustic potash, &c), I can venture positively to 

 assert that there is no vestige of a mouth, or masticatory 

 organs, or stomach : I did not see any anus, but I will 

 not affirm that such does not exist. 



In the upper part of the animal, lying under the 

 superficial muscles, and close beneath the upper line 

 of their attachment, I found in all the specimens, an 

 eye, of a pointed oval form, rather less than the i^ths 

 of an inch in diameter, formed of an outer capsule, lined 

 with purple pigment-cells, and surrounding, as it appeared, 

 a lens. The eye is not introduced in fig. 9, for I could not 

 see it, except by dissection, and therefore do not know 

 its exact relative position. 



Generative System. — The contents of the animal, be- 

 tween the sack containing the thorax and the outer inte- 

 guments, and directly under the thorax, varied much in 

 condition : in young and , lately attached specimens the 

 whole consisted of a pulpy mass with numerous oil- 

 globules ; in other specimens, apparently more mature, 



