196 IBLA CTJMINGII 



in the usual bell- shaped expansion, entering one side of 

 the small globular stomach ; the latter, at its lower end, 

 is slightly constricted, and then is rather abruptly up- 

 turned. The rectum is of unparalleled length, and ex- 

 tremely narrow; it can be best detected after the dis- 

 solution by caustic potash of the softer parts, when its 

 inner coat of chitine can be seen to be continuous, in the 

 ordinary manner, with the outer integuments of the thorax, 

 The anus, as already stated, is seated on a slight swelling, 

 and consists of a small longitudinal slit (f, fig. 2), placed 

 close outside the two very minute caudal appendages. 



Organ of Sight. — In all the specimens, a little below 

 the fold separating the mouth from the peduncle, and near 

 the abdominal (or rostral) edge, a black ball (c f fig. 1), 

 about lith of an inch in diameter, is conspicuous. When 

 dissected out, it is somewhat conical in form, and appears 

 to consist of an outer coat, with a layer of pigment-cells 

 of a dark purple colour, surrounding a transparent, rather 

 hard lens, apparently leaving a circular orifice at the 

 summit, and forming a short tube at the base, sur- 

 rounding what I believe to be a nerve. I was not able 

 to perceive that this eye consisted of two eyes united, 

 which the analogy of other Cirripedes makes me suppose 

 probable, although in the ordinary and hermaphrodite 

 Ibla quadrivalvis, the eye also appeared single. It is 

 seated under the two transparent muscular layers, close 

 upon the upper end of the stomach, and this is the exact 

 position, as stated in the introductory discussion (p. 49), 

 in which the eyes of pedunculated Cirripedes are com- 

 monly situated. 



Generative System. — Within the muscular layer all 

 round the upper part of the peduncle, and surrounding 

 the stomach, there are numerous, little, rather irregular 

 globular balls, with brown granular centres, so closely 

 resembling the testes in other Cirripedes, though of 

 smaller size, that I cannot doubt that this is their nature : 

 they were much plainer, larger, and more numerous in 

 some specimens than in others. The vesicular seminales 



