1922J 



Branch: Internal Anatomy of Trichoptera 



275 



INDEX TO FIGURES. 



a = anus. 



abg = abdominal ganglia 1 to 8. 



abs = abdominal segment 1 to 9. 



ant = antennal nerve. 



af = alary muscle 1 to 9. 



b= nerve to front .of head. 



bc = buccal cavity. 



bg = blood gills. 



bm = basement membrane. 



c = crura cerebri. 



cr = crop. 



cm = circular muscles. 



cp = corpuscle. 



ct = conducting tubule. 



dep = digestive epithelium. 



dh = drag hooks. 



dv= dorsal vessel. 



ep = epithelium. 



ex = expansion area. 



excm = exterior circular muscle. 



fa=frontal arm. 



fg= frontal ganglion. 



gd = gonad. 



gdl=gonad in inner aspect. 



gd2 = probable ovary of P. interrupta. 



ggl = Gilson's gland. 



glep= glandular epithelium. 



gsp = spinneret of Gilson's gland. 



in = intima. 



1 = Lumen. 



Itrl = labral nerve. 



Ib2 = labral nerve. 



lb-s = labral sclerite. 



111 = labial nerve. 



112 = labial nerve. 

 li-s = labial sclerite. 

 l-int = large intestine. 

 1m = longitudinal muscle. 

 md2 = mandibular nerve. 



md-s = mandibular sclerite. 



me = mesenteron. 



mp = Malpighian tubule. 



mpl = dorso-lateral pair. 



mp2 = lateral pair. 



mp3 = ventral pair. 



ms = mesothorax. 



mstg = mesothoracic ganglion. 



mt=metathorax. 



mttg = metathoracic ganglion. 



n = nucleus. 



oe = oesophagus. 



og = opening of gland. 



opt = optic nerve. 



oev = oesophageal valve. 



or=oesophageal ring. 



p = pigment. 



pm = gills press muscles. 



pr = proventriculus. 



pro = prothorax. 



protg = prothoracic ganglion. 



ptm = perotrophic membrane. 



r = rectum. 



rm = retractile muscle. 



rn = recurrent nerve. 



rv = rectal valve. 



rw = rectal wall. 



s = sympathetic ganglion. 



sb-oeg = sub-oesophageal ganglion. 



spr-oeg = supra-oesophageal ganglion. 



skc = silk gland duct. 



skp = silk gland proper. 



sb = striated border. 



sm-int = small intestine. 



sp = spinneret. 



t = tubule. 



tr = trachea. 



y = ventral end ot ovary. 



