Report on Larval Crahs. 17 



deep, the yellow is superficial. A red corpuscle was present on each side 

 of the mouth i-egion. 



Thompson* describes the first Zoeee of Eupagurths longicarpus and 

 Eiipagurus annuUpes : — " The transparent body is pigmented with con- 

 tractile scarlet and yellow chromatophores ; the eyes are black with yellow 

 pigment diffused over them. The livers contain stongly I'efractive yellow 

 globules." 



Sarst describes and figures the Zoese of bernhardus, bvit the pigment is 

 not shown. 



Galathea dispersa. 



The protozoea of this species is shown in fig. 8. Date, June 4. 



Crangon trispinosus (Hailstone). 



The eggs of this form hatched on August 18. The I. Zoea (fig. 5) 

 resembles much the I. Zoea of Crangon mdgaris. The dorsal spine is 

 absent from the hind border of the third abdominal segment, and the fifth 

 segment is not provided with lateral teeth on its posterior border. 



The colouration is more intense than in Crangon vidgaris. Yellow 

 pigment is present on the eye, maxillipedes, side of the thorax, and along 

 the side of the abdomen. At places on the sides it is concentrated into 

 luminous spots. Purple-pink pigment is located ventral to the eyes, 

 laterally and ventrally in the cephalothorax, and over the lower surface 

 of the abdomen. Medially in the cephalothorax there is situated both 

 dorsally and ventrally a large quantity of purple pigment. The antennules 

 are deeply coloured with yellow and purple. 



Gurney,+ who described and figured the first and last Zoea of this 

 species, gives the following account of the colouration : — " The body is 

 light greenish-yellow in colour, with a conspicuous branching chromatophore 

 placed dorsally in the middle of the thorax." 



Cancer pagiorus, L. 



When the eggs are ready to hatch both protozoeae and I. Zoese may be 

 obtained at once by washing the ova. It is evident from this fact that the 

 normal procedure is for the larva to get rid of the protozoean cuticle at 

 once on becoming free from the egg. 



Protozoea. Pig. 51. 



One specimen measured 1"3 mm. in length. The antennae, antennules 

 (fig. 57), and telson (fig. 62) are furnished with plumose ajipendages. The 

 lateral spines were almost full-sized, but the rostral spine, r, was only 

 represented by its point which projected from the cushion-like anterior 

 extremity of the larva (figs. 51 and 57). The dorsal spine is still in- 

 vaginated. The second maxillipede (fig. 61) is without projecting spines 

 and setse. The limb is covered with a delicate cuticle. 



* Millet T. Thompson : " The Metamorphosis of the Hermit Crab." Proceedings 

 of the Boston Society of Natural History, Vol. 31, No. 4. Bostou, 1903, pp. 147-209, 

 pi. 4-10. 



t G. 0. Sars : ' ' Bidrag tel Kundskaben om Decapodernes Forvandlinger " II. 

 Lithodes Eupagurus, Spiropagurus Galathodes, Ualathea, Munida, Porcellana, 

 Nephrops. Archivfor Mathematik og Naturvidenslcab, 13 B. 1890, p. 133, 7 plates. 



+ Gurney : " Metamorphoses of the Decapod Crustaceans," jEgeon (Crangon) 

 fasciatus, Risso, and jEgeon [Crangon) trispinosus (Hailstone). Proc. Zool. Socy., 

 Land., 1903. Vol. ii., p. 24, 2 plates. 



