272 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Plate 32. 



Pyrosoma atlanticum, form dipleurosoma. 



Fig. 39. — A colony, seen from the flattened face. X§. After Brooks (1906). 

 40. — An edge view of a colony. Xf. After Brooks (1906). 

 41. — The open end of a colony. Xf. After Brooks (1906). 



Plate 33. 



Fig. 42. — Pyrosoma agassizi: An unretouched photograph of a colony. Xl£. 

 43. — P. verticillatum cylindricum: An unretouched photograph of a colony. X2. 

 44. — P. ellipticum: An unretouched photograph of a colony. Xl£. 



Plate 34. 



Fig. 45. — Pyrosoma atlanticum atlanticum: An unretouched photograph of a colony. 

 About natural size. 



46. — An unretouched photograph of the open end of the colony shown in figure 45. 

 Slightly enlarged. 



47. — P. atlanticum, form dipleurosoma: An unretouched photograph of a twisted 

 colony, partly in edge view, partly in face view. About natural size. 



Plate 35. 



Fig. 48. — Pyrosoma atlanticum echinalum: An unretouched photograph of a colony. 

 About natural size. 



49. — P. atlanticum hawaiiense: An unretouched photograph of a colony. About 

 natural size. 



Plate 36. 



Figs. 50-53. — Pyrosoma atlanticum, subspecies doubtful, figure 53 shows a form 

 resembling the type of the species: Retouched photographs of young colonies. The 

 open ends of the colonies are toward the top of the plate except in figure 51, which is 

 a view of the closed end of the same colony that is shown in figure 50. X about li. 



54. — P. hybridum, a retouched photograph, showing the flattened face of the colony 



XI*. 



55. — A retouched photograph, in edge view, of the same colony as that shown in 

 figure 54. Xli- 



Tnis manuscript was completed for the United States Bureau of 

 Fisheries on July 10, 1915, and received for publication by the United 

 Stales National Museum on February 21, 1917. 



