354 ERNEST WAEREN. 



Fig. 33.— X 90. Side view of piece of pinna of Halicornaria seg- 

 mentata sp. n. 



Fig. 3i. — x DO. Front view of piece of pinna of H. segmentata, 

 showing hole (o.S.) at base of mesial nematophore {m.n.) for a sarco- 

 style. 



Fig. 35. — x 500. Median longitudinal section of mesial nematophore 

 of H. segmentata, showing sarcostyle (S.), battery of nematocysts 

 {B.ii.), and conspicuously large cell filled with globules (e.g.). 



Fig. 36.— X 900. Small piece of body- wall of hydranth of H. seg- 

 mentata, showing cells filled with dark globules {c.j).). They occur 

 both in the ectoderm and endoderm. 



Fig. 37. — X 900. Small piece of body-wall of the hydranth of the 

 black variety of Sertularia loculosa Bxisli, showing cells, which are 

 often peai'-shaped, containing dark l:>rown matter {cp.). They appear 

 to be confined to the endoderm. 



Fig. 38. — x 90. Median longitudinal section through the hydrotheca 

 and hydranth of Thy rose yphiis ajqiialis sp. u. The diaphragm is 

 excentrically perforated. The hydrotheca is lined by a sheet of ecto- 

 derm, which, at the upper region, ispi-ovided with two large l;)atteries of 

 elongated nematocysts {B.n.). 



Fig. 39. — x lUOO. Elongated discharged nematocyst of T. aMpiali s 

 in cnidoblast. 



Fig. 40. — x 1000. Undischarged nematocyst. 



Explanatory References for Plates and Text-figures. 



a. Aperture, a. h. Line of section for fig. D. ah. h. Abcauline knob 

 of perisarc. ad. h. Adcauline knobs of perisarc. «p. Appendage. A)-. 

 Archenteron. 



b. Branch, h. hi. Branched blastostyle. h. c. Budding corbula. h.d. 

 Basal dilatation, h.li. Base of hydranth. b.hy. Branch of hydrorhiza. 

 h. M. Basal mass of skeletal endoderm. B. ». Battery of nematocysts. 

 hi Blastostyle. 



C. Cortex, c. Cuticle, c. c. Collar cell. C. D. Dilatation of ccelen- 

 teron. c. e. Common ectoderm. c. ij. Cell filled with globules of 

 yolk (?). c.hy. Contracted hydranth. c. p. Cell with " pigment." c. t. 

 Capitate tentacles. C. W. Coralline sea- weed. cli. Chelicerts. cl. 

 Claw of chelicera\ en. Cnidoblast. co. Corbula. coe. Ccelenteron. 



d. Diaphragm. (/. cj. Developing gall. d. it. Discharged nema- 

 tocyst. d. t. Distal tentacles. 



e. C. Enveloping cortex, e. c. Endoderm canal, ec. c. Ectodermal 

 cavity, e. e. Everted endoderm. cej). Endodernial epitheliinn. e.g. 



